$\lim_{x\to0}\left(\frac{4x}{e^{2x}-1}\right)$
$\int_{0}^{\frac{\pi}{4}}\sec^{4}\thetad\theta$
$34md\:-\:13mp\:+\:7m\:2\:-\:13md\:+\:11m\:2\:-\:8mp$
$\lim\:_{x\to\:\:64}\left(\frac{\sqrt{x}-8}{\sqrt[3]{x}-4}\right)$
$\left(x^2-y+2z\right)^2$
$\frac{z^6.z^9}{z^{-4}}$
$12x+5y-4x+3-y$
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