$\left(+8\right)-\left(-4\right)$
$13\:times\:12$
$5^2\cdot5^{-6}\cdot5^3\cdot5^{-1}$
$x^8-16x^4+64$
$\lim_{x\to0.5}\frac{sin3x}{tan2x}$
$78+980$
$-\left(-1\right)+\left(-1\right)-3$
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