$\left(1-\csc^2\right)\tan^2$
$a+2=6$
$10y+3y+4y+5y$
$\log\left(x-6\right)+\log\left(2\right)=2$
$2-6\left(-5d+1\right)$
$4a\left(13\right)-9ab\left(12\right)$
$\frac{x^3-4x+1}{x\:-\:3}$
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