$\frac{d}{dx}\frac{1}{\sqrt{4x^2-5x+7}}$
$15\:x^{-3}$
$y^2=361$
$\lim_{x\to0}\left(\frac{\sin\left(3x\right)-cos\left(x\right)}{sin^2\left(x\right)}\right)$
$9x^4+12x^2+4$
$\lim_{x\to0}\left(\frac{12\left(sin\left(x\right)-xcos\left(x\right)\right)}{x^3}\right)$
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