$278.05-103.38$
$\left(-79\right)-\left(-25\right)$
$\left(\frac{1}{2}a-\frac{1}{2}\right)\left(\frac{1}{2}a-\frac{1}{2}\right)$
$sen\left(2x\right)cos\left(x\right)=\frac{1}{2}cos\left(x\right)$
$-2-5x-6$
$y'=2y+x^2$
$24-\left(-7\right)$
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