Предмет: Геометрия, автор: lenakrakatitsa1656

. Упростить выражение 2ctg²a*sin²a-cos²a

Ответы

Автор ответа: ilkapilka

2ctg^2a*sin^2a-cos^2a=2cos^2a/sin^2a*sin^2a-cos^2a=2cos^2a-cos^2a=cos^2a

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