$z\:2+\:z\:w\:+\:2\:z\:+\:2\:w\:+\:z\:+\:w$
$\sqrt{36}+\:\sqrt{169}$
$2a^2+7y\left(2a^2-8y^2\right)$
$\frac{sec\left(x\right)-cos\left(x\right)}{tan\left(x\right)+cot\left(x\right)}$
$9-17x<33-11x$
$100\cdot e^{-10f}=0$
$\frac{1}{cos\:a}=\frac{\cos a}{1-sin^2a}$
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