$f\left(x\right)=2x^2+4$
$25x^4-49y^6$
$\left(-2x-y^2\right)$
$2y-3xy+4xy^{2}$
$\frac{\sin\left(x\right)+\cos\left(x\right)}{\sin\left(x\right)}=1-\frac{1}{\tan\left(x\right)}$
$5\:\frac{2}{3}+3\:\frac{2}{9}$
$\int\:\frac{5}{\sqrt{y^2-9}\:}dy$
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