Николай Воскобойников
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Ответ. 3*(tg(x))^2+7=2/((sin(x))^2); 3*((sin(x))^4)+7*(1-((sin(x))^2)*(sin(x))^2-
2*(1-(sin(x))^2)=0; 4*(sin(x))^4)-9*(sin(x))^2+2=0; (2*sin(x)+1)*(2*sin(x)-1)*((sin(x))^2-2)=0; sin(x1)=-0,5; sin(x2)=0,5;