$\left(4x^2\:-\:6y^2\right)^2$
$2.\frac{3}{a}.\frac{b}{2}$
$\left(3a\right)-\left(7b\right)^2$
$\frac{dy}{dx}=x^2y=xe^x$
$\left(3a\left(x-4\right)+b\left(3x\right)\right)\left(3a\left(x-4\right)-b\left|3x\right|\right)$
$\left(x+5\right)\cdot\left(x-5\right)=x^2+x-15$
$6x^5+15x^2-9x$
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