$13x-2x^2-15$
$7\:x\:7$
$\frac{dy}{dt}=\frac{y+3}{1-y}$
$a^2+2ax^2+a\cdot x$
$-72-712$
$\left(c+1\right)\left(c+4\right)$
$\csc\left(v\right)-\cot\left(v\right)\cos\left(v\right)=\sin\left(v\right)$
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