91Ó°ÊÓ

Convert the following to radian measure. $$30^{\circ}, 120^{\circ}, 315^{\circ}$$

Convert the following to radian measure. $$990^{\circ},-270^{\circ},-540^{\circ}$$

Construct angles with the following radian measure. $$-\pi / 4,-3 \pi / 2,-3 \pi$$

Find \(t\) such that \(0 \leq t \leq \pi\) and \(t\) satisfies the stated condition. $$\cos t=\cos (3 \pi / 2)$$