Question: Use the trigonometric addition formulas to prove the double-angle identities (exercises a and b). Then use the double-angle identity given in part b to prove

Use the trigonometric addition formulas to prove the double-angle identities (exercises a and b). Then use the double-angle identity given in part b to prove the half-angle identities (c and d). a) sin 20 = 2 sin 0 cos 0 c) sin20 = = (1 - cos 20) b) cos 20 = cos2 0 - sin2 0 d) cos20 = (1 + cos 20)

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