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受欢迎的三角函数 >

sin(x)+2=-csc(x)

解答

sin (x) + 2 = - csc (x)

解答

x = \frac{3 π}{2} + 2 πn

+1

度数

x = 27 0^{\circ} + 36 0^{\circ} n

求解步骤

sin (x) + 2 = - csc (x)

两边减去

- csc (x)

sin (x) + 2 + csc (x) = 0

使用三角恒等式改写

2 + csc (x) + sin (x)

使用基本三角恒等式:

sin (x) = \frac{1}{csc ( x )}

= 2 + csc (x) + \frac{1}{csc ( x )}

2 + csc (x) + \frac{1}{csc ( x )} = 0

用替代法求解

2 + csc (x) + \frac{1}{csc ( x )} = 0

令

: csc (x) = u

2 + u + \frac{1}{u} = 0

2 + u + \frac{1}{u} = 0 : u = - 1

2 + u + \frac{1}{u} = 0

在两边乘以

u

2 + u + \frac{1}{u} = 0

在两边乘以

u

2 u + uu + \frac{1}{u} u = 0 \cdot u

化简

2 u + uu + \frac{1}{u} u = 0 \cdot u

化简

uu : u^{2}

uu

使用指数法则:

a^{b} \cdot a^{c} = a^{b + c}

uu = u^{1 + 1}

= u^{1 + 1}

数字相加:

1 + 1 = 2

= u^{2}

化简

\frac{1}{u} u : 1

\frac{1}{u} u

分式相乘:

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

= \frac{1 \cdot u}{u}

约分:

u

= 1

化简

0 \cdot u : 0

0 \cdot u

使用法则

0 \cdot a = 0

= 0

2 u + u^{2} + 1 = 0

2 u + u^{2} + 1 = 0

2 u + u^{2} + 1 = 0

解

2 u + u^{2} + 1 = 0 : u = - 1

2 u + u^{2} + 1 = 0

改写成标准形式

a x^{2} + b x + c = 0

u^{2} + 2 u + 1 = 0

使用求根公式求解

u^{2} + 2 u + 1 = 0

二次方程求根公式:

若

a = 1, b = 2, c = 1

u_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 \cdot 1 \cdot 1}{2 \cdot 1}

u_{1, 2} = \frac{- 2 \pm 2 ^{2} - 4 \cdot 1 \cdot 1}{2 \cdot 1}

2^{2} - 4 \cdot 1 \cdot 1 = 0

2^{2} - 4 \cdot 1 \cdot 1

数字相乘:

4 \cdot 1 \cdot 1 = 4

= 2^{2} - 4

2^{2} = 4

= 4 - 4

数字相减:

4 - 4 = 0

= 0

u_{1, 2} = \frac{- 2 \pm 0}{2 \cdot 1}

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

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

\frac{- 2}{2 \cdot 1}

数字相乘:

2 \cdot 1 = 2

= \frac{- 2}{2}

使用分式法则:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{2}{2}

使用法则

\frac{a}{a} = 1

= - 1

u = - 1

二次方程组的解是:

u = - 1

u = - 1

验证解

找到无定义的点（奇点）:

u = 0

取

2 + u + \frac{1}{u}

的分母，令其等于零

u = 0

以下点无定义

u = 0

将不在定义域的点与解相综合:

u = - 1

u = csc (x)

代回

csc (x) = - 1

csc (x) = - 1

csc (x) = - 1 : x = \frac{3 π}{2} + 2 πn

csc (x) = - 1

csc (x) = - 1

的通解

csc (x)

周期表（周期为

2 πn

）：

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

x = \frac{3 π}{2} + 2 πn

x = \frac{3 π}{2} + 2 πn

合并所有解

x = \frac{3 π}{2} + 2 πn

作图

流行的例子

cos (a) = \frac{9}{14}

\frac{π}{2} = 2 sin (x)

cos(x)=(sin(x))^2

cos (x) = (sin (x))^{2}

(tan(2θ))/2 =tan(θ)

\frac{tan ( 2 θ )}{2} = tan (θ)

2sin^2(3x)-3cos(3x)+1=0,0<= x<= 180

2 sin^{2} (3 x) - 3 cos (3 x) + 1 = 0, 0^{\circ} \leq x \leq 18 0^{\circ}