Evaluate the expression \( \sin ^{-1}\left(\cos \left(\frac{7 \pi}{6}\right)\right) \)

Which points are the same as \( \left(15,11^{\circ}\right) \) ? Check all that apply. \( \begin{array}{ll}\left(15,191^{\circ}\right) & \left(15,-349^{\circ}\right) \\ \left(15,371^{\circ}\right) & \left(-15,191^{\circ}\right)\end{array} \)

Solve \( 2 \cos ^{2}(x)-3 \cos (x)-5=0 \) for all solutions. \( x=\square \) where select an answer Give your answer as an exact value.

Prove that: \( \frac{\sin A+\sin 2 A}{1+\cos A+\cos 2 A}=\tan A \)

Which points are the same as \( \left(18,19^{\circ}\right) \) ? Check all that apply. \( \begin{array}{ll}O\left(-18,-161^{\circ}\right) & \bigcirc\left(-18,199^{\circ}\right) \\ \square\left(18,-341^{\circ}\right) & \bigcirc\left(18,199^{\circ}\right) \\ \left(-18,-379^{\circ}\right) & \left(18,379^{\circ}\right)\end{array} \)

1. Un triangolo rettangolo con gli angoli acuti di \( 30^{\circ} \) e \( 60^{\circ} \) ha l'ipotenusa lunga 50 m . \( \rightarrow \) Calcola la lunghezza dei cateti. \( \quad[25 \mathrm{~m} ; 43 \mathrm{~m}] \)