$12ab\:\left(3b\:-\:4a\right)$
$x-3<3x+6$
$\frac{sin\left(3x\right)+2sin\left(2x\right)+sin\left(x\right)}{cos\left(x\right)-cos\left(3x\right)}=cot\left(\frac{x}{2}\right)$
$\int5^{8x+7}dx$
$2x^2+x-15=0$
$x^2-6x-13$
$ab\:+\:b$
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