Question

Tan inverse minus x =-tan inverse x

Oct inverse minus x =π-cot inverse x

Sec inverse minus x =π-sec inverse x

Costco inverse minus x =-cosec inverse x

Answer 1

You have just written some formula,but not specified whata question.These are the formula we need to solve other problems.So you have to byheart it.It's proof is not needed.
Please specify the question when you send it next time.