Find the derivatives of the function f for n = 1, 2, 3, and 4. f(x) = x sin x n = 1 f'(x) = n = 2 f'( x ) = n = 3 f' ( x ) = n = 4 f'( x ) = Use the results to write a general rule for f'(x) in terms of n. f' ( x ) =