(4) If f(x) = cos(cos(tan(x))), calculate f'(2). (5) If y3 = 13 + 2y, find dy (6) If y = (z'+1)"(2 +2) (4+2)5 use logarithmic differentiation to find dy (7) Find the linear approximation of f(x) = x2 + 6 at a = 1