What are some best books for learning inverse trigonometric functions?

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I have learnt elementary trigonometric functions and inverse trigonometric functions. But the materials in my textbook isn't enough for me to gain a deeper understanding. I want to book that provides proofs of various inverse trigonometric formulas and related stuffs. I have already tried some books eg., S. L Loney's Book and some others. I want a book that provides proof for $\tan^{−1}x+\tan^{−1}y=π+\tan^{-1}\frac{x+y}{1−xy}$ when $xy>1$ and related inverse trigonometric formulas. Thank you!