$6mn^2\:-\:mn^2\:-\:3mn^2\:+\:5mn^2$
$\int xe^{av}dx$
$\frac{\sec^2m\cdot\cot^2m}{\tan^2m\cdot\csc^2m}$
$-151\ge-45-a$
$5.3+5.8+6.3+5.0+6.0$
$\left(\frac{x^4+x^2\:-6}{x^4+2x-6}\right)^2$
$-\:90xy\:+\:72xy\:-\:85xy\:+\:125xy\:-\:36xy\:+\:2xy$
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