$binomio\:\left(x^2-36\right)$
$7c^2t+5t^2-21c^2t-7t^2$
$x\int\left(\sec\left(x\right)\tan\left(x\right)\right)dx$
$749\cdot79$
$\frac{d}{dx}x^2-16$
$6+11x<5$
$\left(x-2y\right)^2,x=3,y=-2$
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