This problem is about using the sum and difference formula to prove the trig of an inverse trig function.
What does the reader have to pay attention to in order to not make a mistake?
The reader must pay attention to how the the trig expression was converted to an algebraic expression. Pay close attention to how the Unit Circle values was substituted into the problem. Make sure to always use the first quadrant when you're left with ambiguity (ex: sin (0) could equal = (1, 0) or (-1, 0) but we use (1, 0) in this problem because it's part of the first quadrant.) Remember that cos = x, sin = y, and tan equals y/x :)
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