Prove the Trigonometic identity

Prove the Trigonometic identity

Directions ask to prove the identity

The directions say to prove the identity. I understand how these two functions work, but I don't understand how to go through the process of getting from the left side to the right side.

Directions say to prove the algebraic identity by starting with the Left hand side expression and supplying a sequence of equivalent expressions that ends with the right hand expressions

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