$\frac{\cos\left(x\right)}{\sec\left(x\right)-1}$
$1-z^8$
$32^30$
$9x^4-30x^2y+25xy$
$cot\left(x\right)cos\left(x\right)-cot\left(x\right)$
$\lim_{x\to-1}\:5x+2$
$\left(7x^2-4x+10\right)^2$
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