Trigonometry
Determine the exact value of the given inverse trigonometric function without using a calculator.
y=cos−1(−12)y=\cos^{-1}\left(-\frac12\right)y=cos−1(−21)
y=−π3y=-\frac{\pi}{3}y=−3π
y=2π3y=\frac{2\pi}{3}y=32π
y=3π4y=\frac{3\pi}{4}y=43π
y=−2π3y=-\frac{2\pi}{3}y=−32π