$b^2\:-\:625$
$4m^2-81$
$\left(1x^3+4x^2+3x+3\right)$
$\ln\left(4x^3\right)-\ln\left(7x^6\right)$
$\sec^2xcscx-2cscx=2-sec^2x$
$\frac{x^4}{x^2+9}$
$\int\frac{1}{2x^2+4x+7}dx$
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