Derivation ~ (1) y = 1 / X (2 + 5x) ^ 10 (2) y = xsin (2x + π / 2) cos (2x + π / 2)

Derivation ~ (1) y = 1 / X (2 + 5x) ^ 10 (2) y = xsin (2x + π / 2) cos (2x + π / 2)

1. Y '= {1' × [x (2 + 5x) ^ 10] - [x (2 + 5x) ^ 10] '× 1} / [x (2 + 5x) ^ 10]'. Continue to simplify
2.y'=(-xcos2xsin2x)'=-0.5×(xsin4x)'=-0.5×(4xcos4x+sin4x).