$44a^2+26z+20az+48z^2+441a^2-25z^2$
$\left(\frac{u-1}{2}\right)^2$
$\left(m-n\right)\left(a-2\right)+\left(2m-n\right)\left(a-2\right)$
$-2\left(-4x^2y^3\right)^3$
$\frac{\sin\left(a\right)}{\sin\left(a\right)-\cos\left(a\right)}-\frac{1}{1-\cot\left(a\right)}$
$-x^{a-1}+x^{a-1}$
$\int_{-1}^1e^x\:dx$
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