Предмет: Алгебра, автор: lenixui

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Автор ответа: DocAlfer

1

Ответ:

1/sin²α

Объяснение:

tg(π/2-α) = ctgα

ctg(π-α) = -ctgα

тогда ... = 1+ctg²α = 1 + (cos²α/sin²α) = (sin²α+cos²α)/sin²α = 1/sin²α

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