$\frac{1}{\cos\left(x\right)}-\frac{1}{\cot\left(x\right)}\cdot\frac{1}{\csc\left(x\right)}$
$\int\left(\frac{1}{1+\tan\left(x\right)}\right)dx$
$3x^2-10x+2$
$x^2-40x$
$49x^2-y^2$
$-x+7x-2+3x-5$
$6\left(1-5m\right)$
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