Ответ:
sin²a
Объяснение:
cos²a-cos2a = cos²a - (2cos²a - 1) = -cos²a + 1 = - (cos²a - 1) = - (-sin²a) = sin²a
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Ответ:
sin²a
Объяснение:
cos²a-cos2a = cos²a - (2cos²a - 1) = -cos²a + 1 = - (cos²a - 1) = - (-sin²a) = sin²a