Question

СРОЧНО
1)sin 2a+(sin a-cos a)^2
2)(cos a/1-sin a)-(cos a/1+sin a)

Answer 1

1) = sin 2a +sin^2a - 2*sina*cosa + cos^2a = 2*sina*cosa + sin^2a - 2*sina*cosa + cos^2a = sin^2a + cos^2a = 1

2) = (cosa + sina*cosa - cosa + sina*cosa)/(1-sin^2a) = (2*sina*cosa)/(1-sin^2a) = (2*sina*cosa)/cos^2a = 2*sina/cosa = 2*tga

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