$\lim_{x\to0}\left(\frac{21x\cos\left(x\right)-21\sin\left(x\right)}{x\sin^2\left(x\right)}\right)$
$\int_0^2c\left(2-x\right)dx$
$5+28a^2+4a^2$
$x^2-8^2+2$
$2^{8^{x-2}}=4^{4^{x-1}}$
$y^{'\:}=\sqrt{x+y+1}$
$\frac{dy}{dx}=y^{3x-1}$
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