$4x^2+8x=-3$
$\sin a\cdot\sec a=\tan a$
$x-40=50$
$\lim_{x\to91}\left(csc\:x\right)$
$\left(4-x\right)x\left(-1-x\right)$
$6y\left(4y+5\right)\left(y-3\right)$
$2-6-7-5+1+15-3-10+6$
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