Trigonometry
Determine the angle measure θ\thetaθ without using a calculator. Express the answer in degrees.
θ=sin−1(−12)\theta=\sin^{-1}\left(-\frac12\right)θ=sin−1(−21)
−30∘-30^{\circ}−30∘
210∘210^{\circ}210∘
150∘150^{\circ}150∘
−60∘-60^{\circ}−60∘