三角学示例

$f (x) = \cos^{2} (x) = \frac{1 + \cos (2 x)}{2}$

解题步骤 1

图像。

$f (x) = \cos^{2} (x) = \frac{1 + \cos (2 x)}{2}$

解题步骤 2

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$