What is the general solution for sin(x)+cos(x)= 5/7 ,90>x>0 ?

The general solution for sin(x)+cos(x)= 5/7 ,90>x>0 is No Solution for x\in\mathbb{R}

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular Trigonometry >

sin(x)+cos(x)= 5/7 ,90>x>0

Solution

sin (x) + cos (x) = \frac{5}{7}, 9 0^{\circ} > x > 0^{\circ}

Solution

No Solution for x \in R

Solution steps

sin (x) + cos (x) = \frac{5}{7}, 9 0^{\circ} > x > 0^{\circ}

Rewrite using trig identities

sin (x) + cos (x)

sin (x) + cos (x) = 2 sin (x + 4 5^{\circ})

sin (x) + cos (x)

Rewrite as

= 2 (\frac{1}{2} sin (x) + \frac{1}{2} cos (x))

Use the following trivial identity:

cos (\frac{π}{4}) = \frac{1}{2}

Use the following trivial identity:

sin (\frac{π}{4}) = \frac{1}{2}

= 2 (cos (4 5^{\circ}) sin (x) + sin (4 5^{\circ}) cos (x))

Use the Angle Sum identity:

sin (s + t) = sin (s) cos (t) + cos (s) sin (t)

= 2 sin (x + 4 5^{\circ})

= 2 sin (x + 4 5^{\circ})

2 sin (x + 4 5^{\circ}) = \frac{5}{7}

Divide both sides by

2

2 sin (x + 4 5^{\circ}) = \frac{5}{7}

Divide both sides by

2

\frac{2 sin ( x + 4 5 ^{\circ} )}{2} = \frac{\frac{5}{7}}{2}

Simplify

\frac{2 sin ( x + 4 5 ^{\circ} )}{2} = \frac{\frac{5}{7}}{2}

Simplify

\frac{2 sin ( x + 4 5 ^{\circ} )}{2} : sin (x + 4 5^{\circ})

\frac{2 sin ( x + 4 5 ^{\circ} )}{2}

Cancel the common factor:

2

= sin (x + 4 5^{\circ})

Simplify

\frac{\frac{5}{7}}{2} : \frac{5 2}{14}

\frac{\frac{5}{7}}{2}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{5}{7 2}

Rationalize

\frac{5}{7 2} : \frac{5 2}{14}

\frac{5}{7 2}

Multiply by the conjugate

\frac{2}{2}

= \frac{5 2}{7 2 2}

722 = 14

722

Apply radical rule:

a a = a

22 = 2

= 7 \cdot 2

Multiply the numbers:

7 \cdot 2 = 14

= 14

= \frac{5 2}{14}

= \frac{5 2}{14}

sin (x + 4 5^{\circ}) = \frac{5 2}{14}

sin (x + 4 5^{\circ}) = \frac{5 2}{14}

sin (x + 4 5^{\circ}) = \frac{5 2}{14}

Apply trig inverse properties

sin (x + 4 5^{\circ}) = \frac{5 2}{14}

General solutions for

sin (x + 4 5^{\circ}) = \frac{5 2}{14}

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

x + 4 5^{\circ} = arcsin (\frac{5 2}{14}) + 36 0^{\circ} n, x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

x + 4 5^{\circ} = arcsin (\frac{5 2}{14}) + 36 0^{\circ} n, x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

Solve

x + 4 5^{\circ} = arcsin (\frac{5 2}{14}) + 36 0^{\circ} n : x = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x + 4 5^{\circ} = arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

Simplify

arcsin (\frac{5 2}{14}) + 36 0^{\circ} n : arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

\frac{5 2}{14} = \frac{5}{7 2}

\frac{5 2}{14}

Factor

14 : 2 \cdot 7

Factor

14 = 2 \cdot 7

= \frac{5 2}{2 \cdot 7}

Cancel

\frac{5 2}{2 \cdot 7} : \frac{5}{2 \cdot 7}

\frac{5 2}{2 \cdot 7}

Apply radical rule:

n a = a^{\frac{1}{n}}

2 = 2^{\frac{1}{2}}

= \frac{5 \cdot 2 ^{\frac{1}{2}}}{2 \cdot 7}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{5}{7 \cdot 2 ^{- \frac{1}{2} + 1}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{5}{7 \cdot 2 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

2^{\frac{1}{2}} = 2

= \frac{5}{7 2}

= \frac{5}{2 \cdot 7}

= arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

x + 4 5^{\circ} = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

Move

4 5^{\circ}

to the right side

x + 4 5^{\circ} = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

Subtract

4 5^{\circ}

from both sides

x + 4 5^{\circ} - 4 5^{\circ} = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

x + 4 5^{\circ} - 4 5^{\circ} = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

x + 4 5^{\circ} - 4 5^{\circ} : x

x + 4 5^{\circ} - 4 5^{\circ}

Add similar elements:

4 5^{\circ} - 4 5^{\circ} = 0

= x

Simplify

arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ} : arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

= arcsin (\frac{5 2}{14}) + 36 0^{\circ} n - 4 5^{\circ}

\frac{5 2}{14} = \frac{5}{7 2}

\frac{5 2}{14}

Factor

14 : 2 \cdot 7

Factor

14 = 2 \cdot 7

= \frac{5 2}{2 \cdot 7}

Cancel

\frac{5 2}{2 \cdot 7} : \frac{5}{2 \cdot 7}

\frac{5 2}{2 \cdot 7}

Apply radical rule:

n a = a^{\frac{1}{n}}

2 = 2^{\frac{1}{2}}

= \frac{5 \cdot 2 ^{\frac{1}{2}}}{2 \cdot 7}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{5}{7 \cdot 2 ^{- \frac{1}{2} + 1}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{5}{7 \cdot 2 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

2^{\frac{1}{2}} = 2

= \frac{5}{7 2}

= \frac{5}{2 \cdot 7}

= arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Could not simplify further

= arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Solve

x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n : x = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

Simplify

18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n : 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n

\frac{5 2}{14} = \frac{5}{7 2}

\frac{5 2}{14}

Factor

14 : 2 \cdot 7

Factor

14 = 2 \cdot 7

= \frac{5 2}{2 \cdot 7}

Cancel

\frac{5 2}{2 \cdot 7} : \frac{5}{2 \cdot 7}

\frac{5 2}{2 \cdot 7}

Apply radical rule:

n a = a^{\frac{1}{n}}

2 = 2^{\frac{1}{2}}

= \frac{5 \cdot 2 ^{\frac{1}{2}}}{2 \cdot 7}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{5}{7 \cdot 2 ^{- \frac{1}{2} + 1}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{5}{7 \cdot 2 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

2^{\frac{1}{2}} = 2

= \frac{5}{7 2}

= \frac{5}{2 \cdot 7}

= 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

Move

4 5^{\circ}

to the right side

x + 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n

Subtract

4 5^{\circ}

from both sides

x + 4 5^{\circ} - 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

x + 4 5^{\circ} - 4 5^{\circ} = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Simplify

x + 4 5^{\circ} - 4 5^{\circ} : x

x + 4 5^{\circ} - 4 5^{\circ}

Add similar elements:

4 5^{\circ} - 4 5^{\circ} = 0

= x

Simplify

18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ} : 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

= 18 0^{\circ} - arcsin (\frac{5 2}{14}) + 36 0^{\circ} n - 4 5^{\circ}

\frac{5 2}{14} = \frac{5}{7 2}

\frac{5 2}{14}

Factor

14 : 2 \cdot 7

Factor

14 = 2 \cdot 7

= \frac{5 2}{2 \cdot 7}

Cancel

\frac{5 2}{2 \cdot 7} : \frac{5}{2 \cdot 7}

\frac{5 2}{2 \cdot 7}

Apply radical rule:

n a = a^{\frac{1}{n}}

2 = 2^{\frac{1}{2}}

= \frac{5 \cdot 2 ^{\frac{1}{2}}}{2 \cdot 7}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{5}{7 \cdot 2 ^{- \frac{1}{2} + 1}}

Subtract the numbers:

1 - \frac{1}{2} = \frac{1}{2}

= \frac{5}{7 \cdot 2 ^{\frac{1}{2}}}

Apply radical rule:

a^{\frac{1}{n}} = n a

2^{\frac{1}{2}} = 2

= \frac{5}{7 2}

= \frac{5}{2 \cdot 7}

= 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Could not simplify further

= 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

x = arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}, x = 18 0^{\circ} - arcsin (\frac{5}{7 2}) + 36 0^{\circ} n - 4 5^{\circ}

Solutions for the range

9 0^{\circ} > x > 0

No Solution for x \in R

Graph

Popular Examples

2cos^2(θ)+cos(θ)-1=0,\forall 0<= θ<2pi

2cos(45-x)=1

sin(θ)=0.35

sin(θ)=0.07

9sin^2(x)tan(x)=16tan(x)

Frequently Asked Questions (FAQ)

What is the general solution for sin(x)+cos(x)= 5/7 ,90>x>0 ?
The general solution for sin(x)+cos(x)= 5/7 ,90>x>0 is No Solution for x\in\mathbb{R}