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Cos cos square 75 + cos square 15 equal to 1 proof |
| Answer» Cos2 75 +cos2 15 = 1Cos2 (90-15) + cos2 15=1Sin2 15 + cos2 15 = 1(sin2Q + cos2Q = 1)Hence, sin2 15 +cos2 15=11=1 | |