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Автор - Ugarashka

Помогите решить уравнение
 sqrt{9-x^{2} (sin2x-3cosx)=0

Ответ

Автор - hlopushinairina
√(9-x²)(sin2x-3cosx)=0;
√(9-x²)=0⇒x²=9;
x=+3;x=-3;
sin2x-3cosx=0;⇒
2sinxcosx-3cosx=0;⇒cosx(2sinx-3)=0
cosx=0;⇒x=π/2+kπ;k∈Z;
2sinx-3=0;⇒sinx=3/2-решения нет,т.к.-1≤sinx≤1;

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