{
"query": {
"display": "$$\\sin\\left(x\\right)+\\sin^{2}\\left(x\\right)+\\cos\\left(x\\right)+\\cos^{2}\\left(x\\right)=0$$",
"symbolab_question": "EQUATION#\\sin(x)+\\sin^{2}(x)+\\cos(x)+\\cos^{2}(x)=0"
},
"solution": {
"level": "PERFORMED",
"subject": "Trigonometry",
"topic": "Trig Equations",
"subTopic": "Trig Equations",
"default": "x=2πn+π,x=2πn+\\frac{3π}{2}",
"degrees": "x=180^{\\circ }+360^{\\circ }n,x=270^{\\circ }+360^{\\circ }n",
"meta": {
"showVerify": true
}
},
"steps": {
"type": "interim",
"title": "$$\\sin\\left(x\\right)+\\sin^{2}\\left(x\\right)+\\cos\\left(x\\right)+\\cos^{2}\\left(x\\right)=0{\\quad:\\quad}x=2πn+π,\\:x=2πn+\\frac{3π}{2}$$",
"input": "\\sin\\left(x\\right)+\\sin^{2}\\left(x\\right)+\\cos\\left(x\\right)+\\cos^{2}\\left(x\\right)=0",
"steps": [
{
"type": "interim",
"title": "Rewrite using trig identities",
"input": "\\cos\\left(x\\right)+\\sin\\left(x\\right)+1",
"result": "1+\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)=0",
"steps": [
{
"type": "interim",
"title": "$$\\sin\\left(x\\right)+\\cos\\left(x\\right)=\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)$$",
"input": "\\sin\\left(x\\right)+\\cos\\left(x\\right)",
"steps": [
{
"type": "step",
"primary": "Rewrite as",
"result": "=\\sqrt{2}\\left(\\frac{1}{\\sqrt{2}}\\sin\\left(x\\right)+\\frac{1}{\\sqrt{2}}\\cos\\left(x\\right)\\right)"
},
{
"type": "step",
"primary": "Use the following trivial identity: $$\\cos\\left(\\frac{\\pi}{4}\\right)=\\frac{1}{\\sqrt{2}}$$",
"secondary": [
"Use the following trivial identity: $$\\sin\\left(\\frac{\\pi}{4}\\right)=\\frac{1}{\\sqrt{2}}$$"
],
"result": "=\\sqrt{2}\\left(\\cos\\left(\\frac{π}{4}\\right)\\sin\\left(x\\right)+\\sin\\left(\\frac{π}{4}\\right)\\cos\\left(x\\right)\\right)"
},
{
"type": "step",
"primary": "Use the Angle Sum identity: $$\\sin\\left(s+t\\right)=\\sin\\left(s\\right)\\cos\\left(t\\right)+\\cos\\left(s\\right)\\sin\\left(t\\right)$$",
"result": "=\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)"
}
],
"meta": {
"interimType": "N/A"
}
},
{
"type": "step",
"result": "=1+\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)"
}
],
"meta": {
"interimType": "Trig Rewrite Using Trig identities 0Eq",
"gptData": "pG0PljGlka7rWtIVHz2xymbOTBTIQkBEGSNjyYYsjjDErT97kX84sZPuiUzCW6s7lRPp6QndqgNT+L6IZutAbCMdtD7TRyyPHMsNO2w5AUIFMS0G0HgjUXwc3RQOmn9BYznLdIBaHD4ibBnEILJTDXUHW1mE5UQUTIwuQd6ag+xFcCVria0VBJjrvn819PR2Tu3FvYEB3AYuqlpPwaqiXeY5MMgkVbTN3pnCLEaGvFNFKk3fejFkyiOiq9iG9IkAO/B7UtNBfw19bDRpX2AlzDEZOhzOLFFCWOVe0TAs9Ps/tVtg7k21KzJIFYRgfW7H"
}
},
{
"type": "interim",
"title": "Move $$1\\:$$to the right side",
"input": "1+\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)=0",
"result": "\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)=-1",
"steps": [
{
"type": "step",
"primary": "Subtract $$1$$ from both sides",
"result": "1+\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)-1=0-1"
},
{
"type": "step",
"primary": "Simplify",
"result": "\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)=-1"
}
],
"meta": {
"interimType": "Move to the Right Title 1Eq",
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}
},
{
"type": "interim",
"title": "Divide both sides by $$\\sqrt{2}$$",
"input": "\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)=-1",
"result": "\\sin\\left(x+\\frac{π}{4}\\right)=-\\frac{\\sqrt{2}}{2}",
"steps": [
{
"type": "step",
"primary": "Divide both sides by $$\\sqrt{2}$$",
"result": "\\frac{\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)}{\\sqrt{2}}=\\frac{-1}{\\sqrt{2}}"
},
{
"type": "interim",
"title": "Simplify",
"input": "\\frac{\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)}{\\sqrt{2}}=\\frac{-1}{\\sqrt{2}}",
"result": "\\sin\\left(x+\\frac{π}{4}\\right)=-\\frac{\\sqrt{2}}{2}",
"steps": [
{
"type": "interim",
"title": "Simplify $$\\frac{\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)}{\\sqrt{2}}:{\\quad}\\sin\\left(x+\\frac{π}{4}\\right)$$",
"input": "\\frac{\\sqrt{2}\\sin\\left(x+\\frac{π}{4}\\right)}{\\sqrt{2}}",
"steps": [
{
"type": "step",
"primary": "Cancel the common factor: $$\\sqrt{2}$$",
"result": "=\\sin\\left(x+\\frac{π}{4}\\right)"
}
],
"meta": {
"solvingClass": "Solver",
"interimType": "Generic Simplify Specific 1Eq",
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}
},
{
"type": "interim",
"title": "Simplify $$\\frac{-1}{\\sqrt{2}}:{\\quad}-\\frac{\\sqrt{2}}{2}$$",
"input": "\\frac{-1}{\\sqrt{2}}",
"steps": [
{
"type": "step",
"primary": "Apply the fraction rule: $$\\frac{-a}{b}=-\\frac{a}{b}$$",
"result": "=-\\frac{1}{\\sqrt{2}}"
},
{
"type": "interim",
"title": "Rationalize $$-\\frac{1}{\\sqrt{2}}:{\\quad}-\\frac{\\sqrt{2}}{2}$$",
"input": "-\\frac{1}{\\sqrt{2}}",
"result": "=-\\frac{\\sqrt{2}}{2}",
"steps": [
{
"type": "step",
"primary": "Multiply by the conjugate $$\\frac{\\sqrt{2}}{\\sqrt{2}}$$",
"result": "=-\\frac{1\\cdot\\:\\sqrt{2}}{\\sqrt{2}\\sqrt{2}}",
"meta": {
"title": {
"extension": "To rationalize the denominator, multiply numerator and denominator by the conjugate of the radical $$\\sqrt{2}$$"
}
}
},
{
"type": "step",
"primary": "$$1\\cdot\\:\\sqrt{2}=\\sqrt{2}$$"
},
{
"type": "interim",
"title": "$$\\sqrt{2}\\sqrt{2}=2$$",
"input": "\\sqrt{2}\\sqrt{2}",
"result": "=-\\frac{\\sqrt{2}}{2}",
"steps": [
{
"type": "step",
"primary": "Apply radical rule: $$\\sqrt{a}\\sqrt{a}=a$$",
"secondary": [
"$$\\sqrt{2}\\sqrt{2}=2$$"
],
"result": "=2",
"meta": {
"practiceLink": "/practice/radicals-practice",
"practiceTopic": "Radical Rules"
}
}
],
"meta": {
"solvingClass": "Solver",
"interimType": "Solver",
"gptData": "pG0PljGlka7rWtIVHz2xymbOTBTIQkBEGSNjyYYsjjDErT97kX84sZPuiUzCW6s7OXRSLY4uXiMbvMfICP5T88aFSKFknkW7qg0U6E21MorMwViaLUXkeD+JukROhWdjBJz+17+I6kHbIEeqwhy4mdC5tTYOsrqRy+4iBsRgZTQLmgWGjI523GgzSlA2k6Cv"
}
}
],
"meta": {
"interimType": "Rationalize Title 1Eq"
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"interimType": "Generic Simplify Specific 1Eq",
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}
},
{
"type": "step",
"result": "\\sin\\left(x+\\frac{π}{4}\\right)=-\\frac{\\sqrt{2}}{2}"
}
],
"meta": {
"interimType": "Generic Simplify 0Eq"
}
}
],
"meta": {
"interimType": "Divide Both Sides Specific 1Eq",
"gptData": "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"
}
},
{
"type": "interim",
"title": "General solutions for $$\\sin\\left(x+\\frac{π}{4}\\right)=-\\frac{\\sqrt{2}}{2}$$",
"result": "x+\\frac{π}{4}=\\frac{5π}{4}+2πn,\\:x+\\frac{π}{4}=\\frac{7π}{4}+2πn",
"steps": [
{
"type": "step",
"primary": "$$\\sin\\left(x\\right)$$ periodicity table with $$2πn$$ cycle:<br/>$$\\begin{array}{|c|c|c|c|}\\hline x&\\sin(x)&x&\\sin(x)\\\\\\hline 0&0&π&0\\\\\\hline \\frac{π}{6}&\\frac{1}{2}&\\frac{7π}{6}&-\\frac{1}{2}\\\\\\hline \\frac{π}{4}&\\frac{\\sqrt{2}}{2}&\\frac{5π}{4}&-\\frac{\\sqrt{2}}{2}\\\\\\hline \\frac{π}{3}&\\frac{\\sqrt{3}}{2}&\\frac{4π}{3}&-\\frac{\\sqrt{3}}{2}\\\\\\hline \\frac{π}{2}&1&\\frac{3π}{2}&-1\\\\\\hline \\frac{2π}{3}&\\frac{\\sqrt{3}}{2}&\\frac{5π}{3}&-\\frac{\\sqrt{3}}{2}\\\\\\hline \\frac{3π}{4}&\\frac{\\sqrt{2}}{2}&\\frac{7π}{4}&-\\frac{\\sqrt{2}}{2}\\\\\\hline \\frac{5π}{6}&\\frac{1}{2}&\\frac{11π}{6}&-\\frac{1}{2}\\\\\\hline \\end{array}$$"
},
{
"type": "step",
"result": "x+\\frac{π}{4}=\\frac{5π}{4}+2πn,\\:x+\\frac{π}{4}=\\frac{7π}{4}+2πn"
}
],
"meta": {
"interimType": "Trig General Solutions sin 1Eq"
}
},
{
"type": "interim",
"title": "Solve $$x+\\frac{π}{4}=\\frac{5π}{4}+2πn:{\\quad}x=2πn+π$$",
"input": "x+\\frac{π}{4}=\\frac{5π}{4}+2πn",
"steps": [
{
"type": "interim",
"title": "Move $$\\frac{π}{4}\\:$$to the right side",
"input": "x+\\frac{π}{4}=\\frac{5π}{4}+2πn",
"result": "x=2πn+π",
"steps": [
{
"type": "step",
"primary": "Subtract $$\\frac{π}{4}$$ from both sides",
"result": "x+\\frac{π}{4}-\\frac{π}{4}=\\frac{5π}{4}+2πn-\\frac{π}{4}"
},
{
"type": "interim",
"title": "Simplify",
"input": "x+\\frac{π}{4}-\\frac{π}{4}=\\frac{5π}{4}+2πn-\\frac{π}{4}",
"result": "x=2πn+π",
"steps": [
{
"type": "interim",
"title": "Simplify $$x+\\frac{π}{4}-\\frac{π}{4}:{\\quad}x$$",
"input": "x+\\frac{π}{4}-\\frac{π}{4}",
"steps": [
{
"type": "step",
"primary": "Add similar elements: $$\\frac{π}{4}-\\frac{π}{4}=0$$"
},
{
"type": "step",
"result": "=x"
}
],
"meta": {
"interimType": "Generic Simplify Specific 1Eq"
}
},
{
"type": "interim",
"title": "Simplify $$\\frac{5π}{4}+2πn-\\frac{π}{4}:{\\quad}2πn+π$$",
"input": "\\frac{5π}{4}+2πn-\\frac{π}{4}",
"steps": [
{
"type": "step",
"primary": "Group like terms",
"result": "=2πn-\\frac{π}{4}+\\frac{5π}{4}"
},
{
"type": "interim",
"title": "Combine the fractions $$-\\frac{π}{4}+\\frac{5π}{4}:{\\quad}π$$",
"result": "=2πn+π",
"steps": [
{
"type": "step",
"primary": "Apply rule $$\\frac{a}{c}\\pm\\frac{b}{c}=\\frac{a\\pm\\:b}{c}$$",
"result": "=\\frac{-π+5π}{4}"
},
{
"type": "step",
"primary": "Add similar elements: $$-π+5π=4π$$",
"result": "=\\frac{4π}{4}"
},
{
"type": "step",
"primary": "Divide the numbers: $$\\frac{4}{4}=1$$",
"result": "=π"
}
],
"meta": {
"interimType": "LCD Top Title 1Eq"
}
}
],
"meta": {
"solvingClass": "Solver",
"interimType": "Generic Simplify Specific 1Eq",
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}
},
{
"type": "step",
"result": "x=2πn+π"
}
],
"meta": {
"interimType": "Generic Simplify 0Eq"
}
}
],
"meta": {
"interimType": "Move to the Right Title 1Eq",
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}
}
],
"meta": {
"solvingClass": "Equations",
"interimType": "Generic Solve Title 1Eq"
}
},
{
"type": "interim",
"title": "Solve $$x+\\frac{π}{4}=\\frac{7π}{4}+2πn:{\\quad}x=2πn+\\frac{3π}{2}$$",
"input": "x+\\frac{π}{4}=\\frac{7π}{4}+2πn",
"steps": [
{
"type": "interim",
"title": "Move $$\\frac{π}{4}\\:$$to the right side",
"input": "x+\\frac{π}{4}=\\frac{7π}{4}+2πn",
"result": "x=2πn+\\frac{3π}{2}",
"steps": [
{
"type": "step",
"primary": "Subtract $$\\frac{π}{4}$$ from both sides",
"result": "x+\\frac{π}{4}-\\frac{π}{4}=\\frac{7π}{4}+2πn-\\frac{π}{4}"
},
{
"type": "interim",
"title": "Simplify",
"input": "x+\\frac{π}{4}-\\frac{π}{4}=\\frac{7π}{4}+2πn-\\frac{π}{4}",
"result": "x=2πn+\\frac{3π}{2}",
"steps": [
{
"type": "interim",
"title": "Simplify $$x+\\frac{π}{4}-\\frac{π}{4}:{\\quad}x$$",
"input": "x+\\frac{π}{4}-\\frac{π}{4}",
"steps": [
{
"type": "step",
"primary": "Add similar elements: $$\\frac{π}{4}-\\frac{π}{4}=0$$"
},
{
"type": "step",
"result": "=x"
}
],
"meta": {
"interimType": "Generic Simplify Specific 1Eq"
}
},
{
"type": "interim",
"title": "Simplify $$\\frac{7π}{4}+2πn-\\frac{π}{4}:{\\quad}2πn+\\frac{3π}{2}$$",
"input": "\\frac{7π}{4}+2πn-\\frac{π}{4}",
"steps": [
{
"type": "step",
"primary": "Group like terms",
"result": "=2πn-\\frac{π}{4}+\\frac{7π}{4}"
},
{
"type": "interim",
"title": "Combine the fractions $$-\\frac{π}{4}+\\frac{7π}{4}:{\\quad}\\frac{3π}{2}$$",
"result": "=2πn+\\frac{3π}{2}",
"steps": [
{
"type": "step",
"primary": "Apply rule $$\\frac{a}{c}\\pm\\frac{b}{c}=\\frac{a\\pm\\:b}{c}$$",
"result": "=\\frac{-π+7π}{4}"
},
{
"type": "step",
"primary": "Add similar elements: $$-π+7π=6π$$",
"result": "=\\frac{6π}{4}"
},
{
"type": "step",
"primary": "Cancel the common factor: $$2$$",
"result": "=\\frac{3π}{2}"
}
],
"meta": {
"interimType": "LCD Top Title 1Eq"
}
}
],
"meta": {
"solvingClass": "Solver",
"interimType": "Generic Simplify Specific 1Eq",
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}
},
{
"type": "step",
"result": "x=2πn+\\frac{3π}{2}"
}
],
"meta": {
"interimType": "Generic Simplify 0Eq"
}
}
],
"meta": {
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"result": "x=2πn+π,\\:x=2πn+\\frac{3π}{2}"
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Solution
Solution
+1
Degrees
Solution steps
Rewrite using trig identities
Rewrite as
Use the following trivial identity: Use the following trivial identity:
Use the Angle Sum identity:
Move to the right side
Subtract from both sides
Simplify
Divide both sides by
Divide both sides by
Simplify
Simplify
Cancel the common factor:
Simplify
Apply the fraction rule:
Rationalize
Multiply by the conjugate
Apply radical rule:
General solutions for
periodicity table with cycle:
Solve
Move to the right side
Subtract from both sides
Simplify
Simplify
Add similar elements:
Simplify
Group like terms
Combine the fractions
Apply rule
Add similar elements:
Divide the numbers:
Solve
Move to the right side
Subtract from both sides
Simplify
Simplify
Add similar elements:
Simplify
Group like terms
Combine the fractions
Apply rule
Add similar elements:
Cancel the common factor:
Graph
Popular Examples
4cos^2(x)-4sin(x)-1=0cos^2(x)+1=-2cos(x)sin^3(x)-2sin(x)=02cos^3(x)=cot^3(x)1/((sec^2(a)))+1/((cos^2(a)))=1
Frequently Asked Questions (FAQ)
What is the general solution for sin(x)+sin^2(x)+cos(x)+cos^2(x)=0 ?
The general solution for sin(x)+sin^2(x)+cos(x)+cos^2(x)=0 is x=2pin+pi,x=2pin+(3pi)/2