$\frac{\sec\left(x\right)}{\cos\left(x\right)-\sec\left(x\right)}$
$\frac{9+9\tan\:^2\left(8a\right)}{\sin\:^2\left(8a\right)}$
$14m^2m^3+16mn^2-4n^4$
$6x^2-7y^2=93$
$\int\:x\left(3x+1\right)^7\:\:dx$
$\int\left(nx\right)^{\frac{1-n}{n}}dx$
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