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1) sina-cosa/1-2cos²a
2) (sina/1+cosa + sina/1-cosa) ×sin2a
1) sina-cosa/1-2cos²a
2) (sina/1+cosa + sina/1-cosa) ×sin2a
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Ответ:
Пошаговое объяснение:
sina-cosa/1-2cos²a=sina-cosa-2cos²a
(sina/1+cosa + sina/1-cosa) ×sin2a=(sina+cosa + sina-cosa) ×sin2a=(sina+ sina) ×sin2a=2sinasin2a=2sina*2sinacosa=4sin^2acosa