$\int\left(\frac{p}{2}\right)dp$
$a.\:\left(x-y\right)\left(x+y\right)$
$16.03+14.4$
$\frac{1}{2}+\:\frac{6}{4}$
$4cos^2x+2sin^2x-3=cos2x$
$-7x^2\:para\:x=-1$
$-0.49x^2-1.4xy\:-y^2$
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