Question

2-sin^2альфа- cos^2альфа/3 sin^альфа+3 cos^2 альфа

Answer 1

$frac{2-sin^2 -cos^2 a}{3sin^2a+3cos^2 a}=\\ frac{2-(sin^2 a+cos^2 a)}{3(sin^2 a+cos^2 a)}=\\ frac{2-1}{3*1}=frac{1}{3}$