$\lim_{x\to infinity}\left(\frac{20x}{\sqrt{4x^2+21}}\right)$
$b^2-4b-5$
$\sin^2y-\sin^2y\cdot\cos^2y$
$\lim_{x\to infinity}\left(\frac{-x}{3e^{3x}}\right)$
$\tan^2x+2\tan x-24=0$
$g\left(x\right)=\frac{\left(6x^3+9x\right)}{\left(2x^2-5x\right)}$
$94x^2+12x-16$
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