$x^2+4x+2^2$
$5x^3+15x^2+5$
$\left(4a^2-9b^2\right)^3$
$2y^23x$
$\frac{dy}{dx}+\frac{3xy+y^2}{x^2+xy}=0$
$\int\:\frac{cos^2x}{1-sinx}dx$
$\int\cos^2\left(4x\right)\sec\left(4x\right)dx$
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