$ay\:+\:by\:+\:ax\:+\:bx\:$
$10x^4y^2z^5m+18x^2y^3z^3m^4$
$cos^2x-\left(\frac{4}{5}\right)^2x$
$x^2\left(x-3\right)\left(x+3\right)$
$3^{4-2}$
$\frac{x^2-6x+9}{5x-15}$
$cotx-\csc x$
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