Предмет: Алгебра, автор: ichkingl88076

Решите пж cos^2x+cos^2 3x=1

Ответы

Автор ответа: shimurareya

Ответ:

Объяснение:

cos^2x+cos^2 3x=1

1+cos(4x)/2+1+cos(6x)/2=1 /*2

cos(4x)+cos(6x)=0

2cos(10x/2)cos(-x)

cos(5x)cos(x)=0

x=pi/10+pn/5

x=pi/2+pn

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