$2x+y-x-2y$
$\left(2a+6a\right)\left(2a-6b\right)$
$\left(2c+5\right)\left(2c+6\right)$
$\frac{2x}{xy}$
$\sec\left(1-\sin^2\left(x\right)\right)=\cos x$
$\left(10^3\right)^5$
$3\cdot1800$
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