Ответ:
Объяснение:
(1-sin²t)(ctg²t+1)=(cos²t)((cos²t/sin²t)+1)=(cos²t)(cos²t+sin²t)/sin²t=
=(cos²t)1/sin²t=cos²t/sin²t=ctg²t
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Ответ:
Объяснение:
(1-sin²t)(ctg²t+1)=(cos²t)((cos²t/sin²t)+1)=(cos²t)(cos²t+sin²t)/sin²t=
=(cos²t)1/sin²t=cos²t/sin²t=ctg²t