$-7\cdot\left(-1\right)-4\cdot\left(-8\right)+1$
$\left(\frac{9a^{-2}b^{-4}}{36a^{-2}b^{-3}}\right)^{-2}$
$49x^2+154x+144$
$3-2+7+9-5+1-7$
$\lim_{y\to0}\frac{\sin^2y}{1+\cos\left(y\right)}$
$\left(16x^2-7x-8\right)-\left(-6x^2-3x+6\right)$
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