$\cos37.5\sin7.5$
$12x^3+2x^2+8$
$\lim_{x\to\infty}\left(\frac{3300x}{x+6}\right)$
$\lim_{x\to\infty}\left(\frac{2x^7-3x^2-2x}{-x^3+x}\right)$
$\frac{dz}{dx}=\left(0.78\right)\left(w\right)$
$9b^2+12b+36$
$x^2-5x-4=0$
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