Предмет: Алгебра, автор: 9rkdsfbr7m

Помогите пожалуйста срочно

Упростите выражения.
tg(180град-а)cos(180 град-а)tg(90 град-а)
——————————————————————
sin(90град+а)ctg(90 град+a)tg(90град+а)

Ответы

Автор ответа: rizvansamsung1122

0

Объяснение:

tg(180-a) /ctg(90-a)= -tga/tga=-1

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