$\csc^2-\cos^2\cdot\csc^2=1$
$12+x^2+x$
$\left(f-n-3z\right)\left(f-n-7z\right)$
$\int5\ln9xdx$
$-5x^2-3x-6x^2+4x$
$\left(9\right)-\left(-92\right)$
$z\left(c+5\right)-8\left(5+c\right)$
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