Question

найдите производную
y=ctg(x/3),при x0=pi

Answer 1

Решение
y=ctg(x/3),при x0=pi
y `= - 1 / [3*sin²(x/3)]
y `(π) = - 1 / [3*sin²(π/3)] = - 1 / [3*(√3/2)²] = - 1 / [3*(3/4)] = - 4/9