$6-12-18+12+16+14-12-14-18$
$\sec\left(u\right)+\tan\left(u\right)\:$
$\left(-9x^4\right)\left(7x^5\right)$
$20+90+51-12-34$
$4\left(0\right)^2-4\left(0\right)-24$
$\frac{1-cos\left(x\right)}{1+cos\left(c\right)}=\left(csc\left(x\right)-cot\left(x\right)\right)^2$
$\frac{16x}{4x}$
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