# Thread: Trigonometry Identities Proving

1. ## Trigonometry Identities Proving

Prove that SinA/1-CotA + Cos A/1 - Tan A = CosA + Sin A

2. ## Re: Trigonometry Identities Proving

Prove that SinA/(1-CotA) + Cos A/(1 - Tan A) = CosA + Sin A
in future, use (grouping symbols) to make your expressions clear

working from the left side ...

start by multiplying the first term by $\dfrac{\sin{A}}{\sin{A}}$ and the second term by $\dfrac{\cos{A}}{\cos{A}}$