$1-\sin\left(x\right)+\sin^4\left(x\right)=\cos^4\left(x\right)$
$\frac{dy}{dx}=ycos\left(4x\right)$
$\frac{-8+r}{2}>-8$
$\frac{x^2+6x+8\:}{x^2+5x+4}$
$\lim\:_{x\to\:14}\:\left(\frac{\sqrt{x+2\:}-4}{x-4}\right)$
$0.21\cdot3.005$
$\frac{3x^4-5^3-20x^1-5}{x^2+x+3}$
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