Question

Тема производные
1. y=ln ctgx. y'(i/4)=?
2. y=x/x-1. y'=?

Answer 1

1)y`=1/ctgx *(-1/sin²x)=-2/sin2x    y`(π/4)=-2/sinπ/2=-2/1=-2
2)y`=(x-1-x)/(x-1)²=-1/(x-1)²