Ответ: - 2sin²t .
Объяснение:
cos2t - 1 = сos²t - sin²t - ( sin²t + cos²t ) = сos²t - sin²t - sin²t - cos²t =
= - 2sin²t .
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Ответ: - 2sin²t .
Объяснение:
cos2t - 1 = сos²t - sin²t - ( sin²t + cos²t ) = сos²t - sin²t - sin²t - cos²t =
= - 2sin²t .