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**1. Homework Statement**

the derivative of CSC u is CSC u times cot u times the derivative of the u

but how can I derive CSC^2 u?

**2. The attempt at a solution**

CSC^2 u is (CSC u)^2

The derivative is

2(CSC u)(CSC u times Cot u)(1)

another way

CSC^2 u = CSC u times CSC u

CSC u times ( CSC u Cot u )(1) + CSC u ( CSC u Cot u)(1)

Is it correct?