D Question 9 1 pts The derivative of f(x) = a sin a is of' (x) = (x)' sin a + x ( sin a)' of'(a) = (2)' + (sin ac)' of' (a) = (a)' (sin a)' of'(a) = (x)' sin ae - x(sin x)' f' ( 20 ) = (ac)' (sin a)' D Question 10 1 pts The derivative of f(x) = cos(7a) is of'(x) = cos' (7x) = sin(7x) of'(x) = cos' (7a) x (7a)' of' (x) = cos' (7x) = - sin(7a) of' (a) = cos(7a) x (7a)' of'(x) = cos' (7x) x (7a)