Question

Помогите!!! Найдите производную функции (фото)

Answer 1

$f(x)=tg^5\frac{3x}{5}\\\\(u^5)'=5u^4\cdot u'\; \; ,\; \; u=tg\frac{3x}{5}\\\\f'(x)=5\cdot tg^4\frac{3x}{5}\cdot (tg\frac{3x}{5})'=\; \Big[\; (tgu)'=\frac{1}{cos^2u}\cdot u'\; \Big]=\\\\=5\cdot tg^4\frac{3x}{5}\cdot \dfrac{1}{cos^2\frac{3x}{5}} \cdot \Big(\dfrac{3x}{5}\Big)'=5\cdot tg^4\frac{3x}{5}\cdot \dfrac{1}{cos^2\frac{3x}{5}}\cdot \dfrac{3}{5}=\dfrac{3\cdot tg^4\frac{3x}{5}}{cos^2\frac{3x}{5}}$