### Calculus - Differentiation of the Function

Please see attached. 1. If f(theta) = 10sin^2 (0.4 theta - 0.1) show that f'(theta) = 4 sin (0.8 theta - 0.2) and evaluate f" (pi / 4) correct to 3 decimal places 2. Differentiate the following functions: i. f (t) = (3t-2) sin 2t ii. f (theta) = 2 cos(3 theta - 1) / 3 theta