$\tan\left(x-0.1\right)=-\cos\left(\pi\right)$
$\left(3m^2n-5m\right)\left(3m^2n+5m\right)$
$xy'\:+\:3y\:=\:x^2$
$e^5=x+1$
$20x^3-30x^2$
$\left(2a+b^2\right)\left(2a-b^2\right)$
$\frac{sen\left(5x\right)+sen\left(x\right)}{cos\left(5x\right)-cos\left(x\right)}$
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