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受欢迎的三角函数 >

sin(x)=csc(x)

解答

sin (x) = csc (x)

解答

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

+1

度数

x = 9 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n

求解步骤

sin (x) = csc (x)

两边减去

csc (x)

sin (x) - csc (x) = 0

使用三角恒等式改写

- csc (x) + sin (x)

使用基本三角恒等式:

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

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

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

用替代法求解

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

令

: csc (x) = u

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

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

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

在两边乘以

u

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

在两边乘以

u

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

化简

- 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

- u^{2} + 1 = 0

- u^{2} + 1 = 0

- u^{2} + 1 = 0

解

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

- u^{2} + 1 = 0

将

1

到右边

- u^{2} + 1 = 0

两边减去

1

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

化简

- u^{2} = - 1

- u^{2} = - 1

两边除以

- 1

- u^{2} = - 1

两边除以

- 1

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

化简

u^{2} = 1

u^{2} = 1

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

u = 1, u = - 1

1 = 1

1

使用法则

1 = 1

= 1

- 1 = - 1

- 1

使用法则

1 = 1

= - 1

u = 1, u = - 1

u = 1, u = - 1

验证解

找到无定义的点（奇点）:

u = 0

取

- 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 = - 1

u = csc (x)

代回

csc (x) = 1, csc (x) = - 1

csc (x) = 1, csc (x) = - 1

csc (x) = 1 : x = \frac{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{π}{2} + 2 πn

x = \frac{π}{2} + 2 πn

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{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

作图

流行的例子

9sin(x)tan(x)=10tan(x)

9 sin (x) tan (x) = 10 tan (x)

3sin^2(θ)+6=2sin^2(θ)+7

3 sin^{2} (θ) + 6 = 2 sin^{2} (θ) + 7

10 sin^{2} (4 x) = 5

cosh (x) = 2

sin(2x)-sin(x)=0,0<= x<= 2pi

sin (2 x) - sin (x) = 0, 0 \leq x \leq 2 π