$816-\left(525\:+\:375\right)$
$\int\left(\tan\left(2x-1\right)^2\right)dx$
$\left(2x-2^2\right)$
$9x^2+72xy+54y^2$
$10x\:+4x\:-\:x$
$x^2+x-\frac{20}{x+5}$
$\frac{d}{dx}\:2\:sen\:\frac{x}{2}$
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