$cos^2\left(x\right)\left(sec\left(x\right)+1\right)\left(sec\left(x\right)-1\right)=1-cos^2\left(x\right)$
$\lim_{x\to0}\left(\frac{2}{\left(x+1\right)\cdot\left(x+2\right)}\right)$
$\left(\frac{2^{-2}x^{-2}y^{-4}z^{-5}}{4^{-1}x^{-4}y^{-3}z^{-6}}\right)$
$\sqrt[2]{x}+4=9$
$\lim_{x\to\left(\frac{\pi}{4}\right)}\left(5\tan\left(x\right)^{\tan\left(2x\right)}\right)$
$\left(6x^2-3x^3\right)\left(6x^2+3x^3\right)$
$3x^2+15x-42=0$
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