$2x^2-12x+16$
$1+\frac{1}{\tan^2a}$
$\frac{1}{\left(y^2+1\right)}\cdot dy-\frac{x}{\left(x+1\right)}\cdot dx=0$
$4\left(x+2\right)-7$
$11\cdot\left(+11\right)$
$\int\frac{x}{49+x^{2}}dx$
$\left(3x^3-y^3+2yx^2\right)\left(2y^2-x^2-3yx\right)$
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