$\lim_{z\to2}\left(\sqrt{7z^2+14z-7}\right)$
$\left(-6.42\right)\left(100\right)$
$\cos\left(2x\right)=\sin\left(x\right)^2+1$
$\left(x+2\right)^2-\left(x-2\right)^2+\left(x+4\right)^2-\left(x-4\right)^2$
$\csc\left(x\right)^2-\csc\left(x\right)$
$4x\:+\:6$
$\left(-1-6\right)^2-8$
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