$y\:2\:x\:y\:2$
$\frac{3\left(cos2x\right)-1}{cosx}$
$\log m=400$
$\left(x\sqrt{3}\right)\left(x+3\right)$
$x^2-15x+108$
$\frac{\sin\left(x\right)\cos\left(x\right)}{x}\frac{1-\cos\left(x\right)^2}{2x^2}$
$\frac{2-x}{2}$
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