Trigonometry
Determine the exact value of the given inverse trigonometric function without using a calculator.
y=cos−1(−22)y=\cos^{-1}\left(-\frac{\sqrt2}{2}\right)y=cos−1(−22)
y=−π4y=-\frac{\pi}{4}y=−4π
y=−3π4y=-\frac{3\pi}{4}y=−43π
y=3π4y=\frac{3\pi}{4}y=43π
y=−2π3y=-\frac{2\pi}{3}y=−32π