Trigonometry Examples

$\cos (20 - \frac{π}{2}) = - 1$

Step 1

The left side $0.91294525$ does not equal to the right side $- 1$ , which means that the given statement is false.

False

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