Предмет: Алгебра, автор: katiakatuysgn

Решить уравнение 25 номер

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Автор ответа: hlopushinairina
0
cos5x/2·cos x/2 +sin5x/2·sinx/2=1;
1/2(cos2x+cos3x)+1/2(cos2x-cos3x)=1;
cos2x=1;
2x=2nπ;n∈Z;
x=nπ;n∈Z
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