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受欢迎的三角函数 >

tan^2(x)+tan(x)=0,0<= x<2pi

解答

tan^{2} (x) + tan (x) = 0, 0 \leq x < 2 π

解答

x = 0, x = π, x = \frac{3 π}{4}, x = \frac{7 π}{4}

+1

度数

x = 0^{\circ}, x = 18 0^{\circ}, x = 13 5^{\circ}, x = 31 5^{\circ}

求解步骤

tan^{2} (x) + tan (x) = 0, 0 \leq x < 2 π

用替代法求解

tan^{2} (x) + tan (x) = 0

令

: tan (x) = u

u^{2} + u = 0

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

u^{2} + u = 0

使用求根公式求解

u^{2} + u = 0

二次方程求根公式:

若

a = 1, b = 1, c = 0

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

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

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

使用法则

1^{a} = 1

1^{2} = 1

= 1 - 4 \cdot 1 \cdot 0

使用法则

0 \cdot a = 0

= 1 - 0

数字相减:

1 - 0 = 1

= 1

使用法则

1 = 1

= 1

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

将解分隔开

u_{1} = \frac{- 1 + 1}{2 \cdot 1}, u_{2} = \frac{- 1 - 1}{2 \cdot 1}

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

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

数字相加/相减:

- 1 + 1 = 0

= \frac{0}{2 \cdot 1}

数字相乘:

2 \cdot 1 = 2

= \frac{0}{2}

使用法则

\frac{0}{a} = 0, a \neq = 0

= 0

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

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

数字相减:

- 1 - 1 = - 2

= \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

二次方程组的解是:

u = 0, u = - 1

u = tan (x)

代回

tan (x) = 0, tan (x) = - 1

tan (x) = 0, tan (x) = - 1

tan (x) = 0, 0 \leq x < 2 π : x = 0, x = π

tan (x) = 0, 0 \leq x < 2 π

tan (x) = 0

的通解

tan (x)

周期表（周期为

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = 0 + πn

x = 0 + πn

解

x = 0 + πn : x = πn

x = 0 + πn

0 + πn = πn

x = πn

x = πn

在

0 \leq x < 2 π

范围内的解

x = 0, x = π

tan (x) = - 1, 0 \leq x < 2 π : x = \frac{3 π}{4}, x = \frac{7 π}{4}

tan (x) = - 1, 0 \leq x < 2 π

tan (x) = - 1

的通解

tan (x)

周期表（周期为

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{3 π}{4} + πn

x = \frac{3 π}{4} + πn

在

0 \leq x < 2 π

范围内的解

x = \frac{3 π}{4}, x = \frac{7 π}{4}

合并所有解

x = 0, x = π, x = \frac{3 π}{4}, x = \frac{7 π}{4}

作图

流行的例子

csc (x) - 1 = 0

cos(2x)+5cos(x)+3=0

cos (2 x) + 5 cos (x) + 3 = 0

2 cos (θ) = 1

sin(x+pi/6)-sin(x-pi/6)= 1/2

sin (x + \frac{π}{6}) - sin (x - \frac{π}{6}) = \frac{1}{2}

tan (θ) = \frac{5}{12}