$\lim x\to-3\:\left(\frac{\left(x^2-9\right)}{\left(x^2\right)}\right)$
$8x^2-6x+21$
$6-\left(-5\right)\cdot\left(-8\right)$
$\sin\left(a\right)\cos\left(b\right)+\sin\left(b\right)\cos\left(a\right)$
$\left(y-8\right)^3$
$\frac{132}{\left(-11\right)}$
$\int_{-0}^2\left(e^{2x+1}\right)du$
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