Find y′y'y′ for y=arccos(2x)y = \arccos(2x)y=arccos(2x).
−21−4x2-\frac{2}{\sqrt{1-4x^2}}−1−4x22
21−4x2\frac{2}{\sqrt{1-4x^2}}1−4x22
−11−4x2-\frac{1}{\sqrt{1-4x^2}}−1−4x21
−21−2x2\frac{-2}{\sqrt{1-2x^2}}1−2x2−2