$\left(7ab+2\right)\left(7ab-11\right)$
$f\left(x\right)=-2\sin\left(0.5x+\pi\right)-3$
$\frac{a^2}{4}+b^2-ab$
$\lim_{x\to1}\left(\frac{x^n-1}{n\left(x-1\right)}\right)$
$\left(6\right)\left(-2\right)\left(-1\right)\left(-2\right)$
$\lim_{x\to5}\left(\frac{x+3}{2x}\right)^{\frac{x+3}{2x}}$
$8-\left(4-8\right)$
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