Помогите пожалуйста...... ;((((((

Решите задачу:

$\tt\displaystyle 1)~y=12-x^2 + x^3 - x^5 + x^3 + \sqrt{x} + \frac{1}{x}\\\\\\y' = 0 - 2x + 2x^2 - 5x^4 + 3x^2 + \frac{1}{2\sqrt{x}}-\frac{1}{x^2}\\\\\\\\2)~y = 13 - 6x^2 + 7x^3 - 6x^4 - 5x^9 + 18\sqrt{x} - \frac{1}{x^5}\\\\\\y' = 0 - 12x + 21x^2 - 24x^3 - 45x^8 + \frac{9}{\sqrt{x}}+\frac{5}{x^6}\\\\\\\\3)~y = 4cosx - 5sinx - 2tgx + 9ctgx\\\\\\y' =-4sinx -5cosx-\frac{2}{cos^2x}-\frac{9}{sin^2x}$