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受欢迎的三角函数 >

4-2cos(2x)=0

解答

4 - 2 cos (2 x) = 0

解答

x \in R 无解

求解步骤

4 - 2 cos (2 x) = 0

将

4

到右边

4 - 2 cos (2 x) = 0

两边减去

4

4 - 2 cos (2 x) - 4 = 0 - 4

化简

- 2 cos (2 x) = - 4

- 2 cos (2 x) = - 4

两边除以

- 2

- 2 cos (2 x) = - 4

两边除以

- 2

\frac{- 2 cos ( 2 x )}{- 2} = \frac{- 4}{- 2}

化简

\frac{- 2 cos ( 2 x )}{- 2} = \frac{- 4}{- 2}

化简

\frac{- 2 cos ( 2 x )}{- 2} : cos (2 x)

\frac{- 2 cos ( 2 x )}{- 2}

使用分式法则:

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

= \frac{2 cos ( 2 x )}{2}

数字相除:

\frac{2}{2} = 1

= cos (2 x)

化简

\frac{- 4}{- 2} : 2

\frac{- 4}{- 2}

使用分式法则:

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

= \frac{4}{2}

数字相除:

\frac{4}{2} = 2

= 2

cos (2 x) = 2

cos (2 x) = 2

cos (2 x) = 2

- 1 \leq cos (x) \leq 1

x \in R 无解

作图

流行的例子

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