Trigonometry Examples

$\cos (- 49) = - \cos (49)$

Step 1

The left side $0.65605902$ does not equal to the right side $- 0.65605902$ , which means that the given statement is false.

False

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