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simplify: cos2(50 + teta) + cos2(40 - teta) (it is cos square) |
| cos2(50+A)+cos2(40-A) cos2(40-A) =cos2(90-(50+A)) =sin2(50+A) Therefore, cos2(50+A)+cos2(40-A) =cos2(50+A)+sin2(50+A) =1 |
