$\left(9x^2-8\right)+\left(9x^2+9x+3\right)$
$\frac{2x^2+9x-5}{6x^2-5x+1}$
$72x^2-x-1$
$\sin\:^2\theta\:\cos\:^2+\cos\:^4\theta\:=\frac{1}{\sec\:^2\theta\:}$
$\lim_{x\to6}\left(\frac{x^2-3x-18}{x-6}\right)$
$\frac{dy}{dx}=x^4-5x^2+4$
$\frac{d}{dx}2x+2$
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