$1+\tan\:x\:\tan\:\frac{x}{2}=\csc\left(x\right)$
$18x+11x$
$\left(4\right)^5\:.\:\left(-2\right)^{12}$
$\int e^{6x+5}dx$
$\log\left(\frac{x^2-2x+1}{x^2-9}\right)$
$5x^2-122x+901$
$s^2+2s+3$
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