$\int\left(2x+3\right)\left(x^{2}+3x\right)^{2}dx$
$\left(-9x^2y^2\right)\left(8xy^4\right)$
$\:-3\left(3+x\right)+4\left(x-6\right)=-4\:$
$0.8a^2+9a-1.3^2-4a$
$4xy''\left(x\right)+2\:y'\left(x\right)+y=0$
$14x^3.9x^3$
$f\left(x\right)=6x^3-2x^2+2x-4$
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