Trigonometry Examples

$\cos (72) = \frac{\sqrt{5} - 1}{4}$

Step 1

The left side $0.30901699$ is equal to the right side $0.30901699$ , which means that the given statement is always true.

True

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