$\left(x-3\right)+\left(x+1\right)$
$\left(4m^2-n^2\right)^2$
$\frac{\left(x\right)}{-3x-1}$
$2x+7y-3x+y-x^2$
$\tan^2x+\cot^2x+7$
$3a^2+a^2+b$
$\int\cot^2x\csc^3xdx$
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