$25cos^2x=9$
$+14+14\left(-14\right)$
$\frac{2x+4}{x-1}$
$\frac{z^7}{z^3}$
$m+7n-10mn+8m-5n$
$9x\:-\:7y\:+\:12y\:-\:5x$
$c+2=7$
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