Simplifying
$x^{-3}.\:x^{10}$
$6a^2+3a$
$\left(3a^{x-4}+b^{3x}\right)\left(3^{x-4}-b^{3x}\right)$
$36x^2-25y^2$
$30\:x\:+\:42\:y\:=\:66$
$\lim_{x\to0}\left(\frac{x\cos\left(x\right)+\sin\left(x\right)}{x^2}\right)$
$36.48\cdot2.2$
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