$\left(2x+y\right)dx-xdy=0$
$5\left(x^2+3y\right)-2\left(4y-x^2\right)$
$x+11=7$
$tan^2\theta\:\:csc^2\theta\:\:cot^2\theta\:\:sin^2\theta\:$
$7x^2y+14x^2-3y-8x^2-9xy+3x^2y$
$\frac{x^3+2x^3+4}{x^3+2x^2+1}$
$\lim_{x\to0}\left(e^{x^2}-1\right).x^2$
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