Предмет: Алгебра, автор: ulianavitashova

синус 690??
распишите как решать парвильно??

Ответы

Автор ответа: nickkazakov
1
Так как синус-функция периодическая с периодом 2π,то sin690 можно представить так: sin690=sin(690-720)=sin(-30)=-sin30=-1/2 720-это 4π
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