A skateboard ramp is built with a base length of 30 feet and a height of 13 feet. Which expression gives the value of \( x \) ? \( \tan ^{-1} \frac{13}{30} \) \( \tan ^{-1} \frac{30}{30} \)

\( \frac { 4 \sin \frac { \alpha } { 2 } \cos \frac { \alpha } { 2 } } { \tan \frac { \alpha } { 2 } } - 1 \)

Find an angle \( \theta \) coterminal to \( -555^{\circ} \), where \( 0^{\circ} \leq \theta<360^{\circ} \)

If \( \theta=\frac{5 \pi}{6} \), then \( \cos (\theta)=\square \) \( \sin (\theta)=\square \) Give exact values. No decimals allowed!

Corvert the following angle from degrees to radians. Express your answer in simplest form.

If \( \cos (\alpha+\beta)=0 \) then \( \sin (\alpha+2 \beta) \)