Find the intervals of increase and decrease for the function x4 - 4x2 + 3 Mark: 12 Find the first and second derivatives of the following functions. For a, find the first derivative from first principles. Fin the first and second derivative of b. Find the secondderivative any way you choose. For c only find the first derivative. a. f(x) = x2 + 1 b. f(x) = cos(x)ex c. f(x) = (x2 - 3x + 2)3sin(2x2 )