$\sqrt{x^1-1}-x$
$\left(9x-7y+9z\right)-\left(3z-4y+2x\right)$
$\left(1+\tan\:\left(\theta\:\right)^2\right)=\sec\:^2\:\theta\:+2\tan\:\left(\theta\:\right)$
$7x^5-\:2x^4\:+\:3x^2;\:x=2$
$\int\:\:sec^2btan^2db$
$\frac{2+2n}{2n-1}$
$\cot^2\left(x\right)+\csc\left(x\right)-1$
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