упростите выражение:
cos^2t-(ctg^2t + 1) * sin^2 t
cos^2t-(ctg^2t + 1) * sin^2 t = cos^2t - 1/sin^2t * sin^2t = cos^2t - 1 = -(1-cos^2t) = -sin^2t
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Verified answer
cos^2t-(ctg^2t + 1) * sin^2 t = cos^2t - 1/sin^2t * sin^2t = cos^2t - 1 = -(1-cos^2t) = -sin^2t