$\frac{4\cdot2^{-3}}{2\cdot4^{-2}}$
$2xy\:+\:4mn\:-1\:+\:3xy\:-2mn\:+6\:+p$
$8m-10^2$
$-5c+2c-c+9$
$5\cdot7.28$
$1-2\sin^2\left(\frac{3\pi}{11}\right)$
$\left(a-m\right)^4$
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