1. f'(x) = 10x⁹
2. f'(x) = - 42x⁵
3. f'(x) =49x⁶-15x⁴ - 8
4. f'(x) = - 18x⁵
5. f'(x) = - 5sin x
6. f'(x) = cos x
7. f'(x) = - sin x + + 1/cos²x
8. f'(x) = 6x⁵-6x² + 5 f'(-3) = 6*(-3)⁵- 6*(-3)² + 5 = -243 -54+5 = -292
9. f'(x) = 30x - 18 f'(0) = 30*0 - 18 = -18