$\frac{10m-2m^2}{2m^2-7m-15}$
$\frac{d^2}{dx^2}\left(x^2+y^2\right)^5$
$\frac{x^3+6x+7}{x}$
$2^x=4^{x+1}$
$\frac{\sec\:x}{\tan\:x}-\frac{\tan\:x}{\sec\:x-1}$
$\log\left(2^n\right)$
$cos3x-cosx$
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