Предмет: Алгебра, автор: lanaabananaaa

Упростите с помощью формул приведения

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Автор ответа: 100275

cos304=cos(360-56)=cos(-56)=cos56
sin(-19п/6)=-sin(19п/6)=-sin(3п+п/6)=sin(п/6)=1/2
tg(-521)=-tg(360+161)=-tg(161)=-tg(180-19)=-tg(-19)=tg19
ctg(11п/3)=ctg(4п-п/3)=ctg(-п/3)=-ctg(п/3)

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