Can you help me to establish identity of csc^2u-csc u sec u=cot^2 u

This is not a valid identity.




Even solving as an equation it has no solutions in the reals.

Are you sure there is no typo?

There are a few identities to keep in mind.



By the given problem, then .

This is not true regardless of the value of x.

Here is a graph of and .

If they were equal, then the graph of each would overlap and be the same. They are not.