$\cot^2\left(-x\right)+1=\csc^2x$
$2x^3+3x^2-2x$
$-4a<6$
$7\:-\:\left(-\:14\right)\:$
$\log9\left(81\right)$
$8\left(2x-3\right)$
$sin^2x+4=-5sinx$
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