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#1. Determine the exact value for cos 1: . Include diagrams. #2. Prove the following identities. Zmnx (a) cos(x + 211') = cosx (W 5i" 2x = 52ch #3. Brett is enjoying a sunset at his cottage. As he sits outside on the deck, the angle of elevation to the sun (ie. angle from the location where he is sitting to the sun] changes from E to E. If the sun is 146 units away from the location from where he is sitting on the deck, determine the exact vertical displacement of the sun over the given angle of displacement. [Assume that the sun's distance from the Earth remains constant.)