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受欢迎的三角函数 >

1/(cot^2(x))+sqrt(3)tan(x)=0

解答

\frac{1}{cot ^{2} ( x )} + 3 tan (x) = 0

解答

x = \frac{2 π}{3} + πn

+1

度数

x = 12 0^{\circ} + 18 0^{\circ} n

求解步骤

\frac{1}{cot ^{2} ( x )} + 3 tan (x) = 0

化简

\frac{1}{cot ^{2} ( x )} + 3 tan (x) : \frac{1 + 3 cot ^{2} ( x ) tan ( x )}{cot ^{2} ( x )}

\frac{1}{cot ^{2} ( x )} + 3 tan (x)

将项转换为分式:

3 tan (x) = \frac{3 tan ( x ) cot ^{2} ( x )}{cot ^{2} ( x )}

= \frac{1}{cot ^{2} ( x )} + \frac{3 tan ( x ) cot ^{2} ( x )}{cot ^{2} ( x )}

因为分母相等，所以合并分式:

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

= \frac{1 + 3 tan ( x ) cot ^{2} ( x )}{cot ^{2} ( x )}

\frac{1 + 3 cot ^{2} ( x ) tan ( x )}{cot ^{2} ( x )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

1 + 3 cot^{2} (x) tan (x) = 0

使用三角恒等式改写

1 + cot^{2} (x) 3 tan (x)

使用基本三角恒等式:

tan (x) = \frac{1}{cot ( x )}

= 1 + cot^{2} (x) 3 \frac{1}{cot ( x )}

cot^{2} (x) 3 \frac{1}{cot ( x )} = 3 cot (x)

cot^{2} (x) 3 \frac{1}{cot ( x )}

分式相乘:

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

= \frac{1 \cdot cot ^{2} ( x ) 3}{cot ( x )}

乘以:

1 \cdot cot^{2} (x) = cot^{2} (x)

= \frac{3 cot ^{2} ( x )}{cot ( x )}

约分:

cot (x)

= 3 cot (x)

= 1 + 3 cot (x)

1 + cot (x) 3 = 0

将

1

到右边

1 + cot (x) 3 = 0

两边减去

1

1 + cot (x) 3 - 1 = 0 - 1

化简

cot (x) 3 = - 1

cot (x) 3 = - 1

两边除以

3

cot (x) 3 = - 1

两边除以

3

\frac{cot ( x ) 3}{3} = \frac{- 1}{3}

化简

\frac{cot ( x ) 3}{3} = \frac{- 1}{3}

化简

\frac{cot ( x ) 3}{3} : cot (x)

\frac{cot ( x ) 3}{3}

约分:

3

= cot (x)

化简

\frac{- 1}{3} : - \frac{3}{3}

\frac{- 1}{3}

使用分式法则:

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

= - \frac{1}{3}

- \frac{1}{3}

有理化:

- \frac{3}{3}

- \frac{1}{3}

乘以共轭根式

\frac{3}{3}

= - \frac{1 \cdot 3}{3 3}

1 \cdot 3 = 3

33 = 3

33

使用根式运算法则:

a a = a

33 = 3

= 3

= - \frac{3}{3}

= - \frac{3}{3}

cot (x) = - \frac{3}{3}

cot (x) = - \frac{3}{3}

cot (x) = - \frac{3}{3}

cot (x) = - \frac{3}{3}

的通解

cot (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} cot (x) \mp \infty 31 \frac{3}{3} 0 - \frac{3}{3} - 1 - 3

x = \frac{2 π}{3} + πn

x = \frac{2 π}{3} + πn

作图

流行的例子

tan (x) = 0.23

tan (x) = 0.45

2cos(x)-1=sec(x)

2 cos (x) - 1 = sec (x)

cos (2 x) = - 0.32

sin((3pi)/2-0)=-cos(x)

sin (\frac{3 π}{2} - 0) = - cos (x)