$\frac{d}{dy}2xe^{\frac{y}{x}}$
$x-3=4$
$\int\:\frac{x^2+x+1}{\left(x^2+2\right)^2}dx$
$\infty-\infty-12$
$\int3y\cdot ln\left(x\right)\cdot x^3dx$
$\frac{\sen^{2}\theta-\cos^{2}\theta}{1-\sin^{2}\theta}$
$\frac{x}{2\:}-\:\frac{3x}{4x}<2x$
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