differentiate x2 cosx from first principle.. Share with your friends Share 9 Chetna Khanna answered this Let f (x) = x2 cos x.Then, f (x + h) = (x + h)2 cos (x + h) 59 View Full Answer Joelene Fernandes answered this is it x2 cos x?? if it is the the derivative of it is y= x2. -sin x + cos x . 2x -4