# How do i Prove this?

#### MEaty

##### New member
so i was given a assignment that says that let y=cotx+cot(x)ln(sinx) given that y''=d2y/dx2. i did solve for the first and second derivative but no matter how many tries and techniques i do ang rule i implement, i just cannot prove that this equation y''/csc^3x=-3cotx+2y. i desperately need an explanation

#### Jomo

##### Elite Member
You really did not ask any question. I suspect that given y = cot + cot(x)ln(sinx) that you want to find d2y/d2x.

If you post your work then we can find your mistake and then guide you to the correct answer.

No one on this site will show you how to do this problem, rather we prefer to you solve this problem.