$\left(2a+5b^2\right)^2-3\left(3a-b^2\right)^2$
$\left(5.2^3\right)^4$
$2\cos^2x+3=7\cos x$
$\left(7a^2+2b^2\right)\left(7a^2-2b^3\right)$
$\lim_{x\to0}\left(\frac{e^x\cdot\sin\left(3x\right)+5\cdot\sin\left(3x\right)}{x}\right)$
$\frac{cosx\:cscx}{cot^2x}=tanx$
$\left(2x+z\right)^2$
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