Пожалуйста помогите с алгеброй

Решите задачу:

$1a. \ \ f(x) = 5x^3-6x^4+3x^2+1. \\ f'(x) = 15x^2 - 24x^3 +6x; f'(1) = -3\\ 1b. \ \ f(x) = 2x \cdot \sin5x\\ f'(x) = 2\sin5x + 2x\cos5x; f'(\frac{\pi}{2}) = 2\\ 2a. \ \ f(x) = \sqrt{3x+2} \\ f'(x) = \frac{1}{2\sqrt{3x+2}} \cdot (3x+2)' = \frac{3}{2\sqrt{3x+2}} \\ 2b. \ \ f(x) = \cos(5x+3) \\ f'(x) = -\sin(5x+3) \cdot (5x+3)' = -5\sin(5x+3)$