$3\left(\sen\frac{\pi}{2}-\cos\frac{\pi}{2}\right)$
$\left(ab+7c\right)^2$
$\int\frac{4}{x\left(x^2+4\right)}dx$
$w-176\le2$
$\left(-3p+2\right)-\left(5p+9\right).$
$5x-27+4-12x$
$\int\frac{3x^2+1}{\left(x^2-1\right)}dx$
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