$\left(2a^2b+5\right)\left(2a^2b-5\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{sin\:2x}{4x^2-\pi\:^2}\right)$
$9z+8zy-5z+zy^2-15xy^2$
$7x-7=7$
$cos\left(2\right)j\:+\:sin\:\left(2\right)j$
$5x^2+7x=2$
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