$\left(x^2+y^2\right)dx+\left(2xy+3y^2\right)dy$
$\frac{sina}{cosa}$
$\frac{d^2y}{dx^2}\left(4x^2-6x-4\right)$
$1\:-\:cos^2x\:=\:2sen^2x$
$-\frac{2}{3}b+\frac{5}{6}b-\frac{1}{6}$
$2\cot+2\tan=2\sec\cdot\csc$
$\left(56a+2b\right)^2$
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