Trigonometry
Determine the angle measure θ\thetaθ without using a calculator. Express the answer in degrees.
θ=csc−1(−233)\theta=\csc^{-1}\left(-\frac{2\sqrt3}{3}\right)θ=csc−1(−323)
150∘150^{\circ}150∘
60∘60^{\circ}60∘
240∘240^{\circ}240∘
−60∘-60^{\circ}−60∘