1 1. 2. 1 2

11. 2cos 2x=1 12. 4cos2x−3=0 Without a calculator compute the following: 13. sin 105° Lets sinx = -5/13 and cos y = 4/5 not in quadrant four find each of the following: 14. sin2x 15. tan 2x 16. cos (x+y) verify the following identities ................
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