$x^2-14x-9=0$
$-2^3-5\cdot\left(-2\right)$
$\left(1-\sin^2z\right)\cdot\left(1+\tan^2z\right)=1$
$x^{2\:}-11x\:+\:60\frac{1}{2}$
$\left(2x^2-x\right)^4$
$\frac{1}{-2}.\frac{-2}{1}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\pi}{2}-x\right)\sec\left(x\right)$
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