$\lim_{x\to0}\left(x^2\cdot x^3\right)$
$12.3ab+6ac-9ad$
$\int4\left(2x^2+1\right)^5dx$
$\left(y^2+yx\right)dx=x^2dy$
$tan\left(2x\right)=2$
$x^2+37x+46$
$cos^2x-cos^4x=cos^2x\:sen^2x$
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