$1-\frac{\sin\left(x\right)\cos\left(x\right)}{\tan\left(x\right)}$
$\left(1+bcd^a\right)^2$
$-2x^2-3+7x=0$
$4x^3-5x^2+3x+-2x^3-x^2+6x$
$\int\left(\left(2x-5x^2\right)\left(x^3+2x^2+9\right)\right)dx$
$2y^2+y-1$
$\left(7x+7\right)\left(7x-4\right)$
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