$-15n^5+4n^5$
$\lim_{x\to1}\left(\left(\frac{2cos^2x+3cosx-2}{2cosx-1}\right)\right)$
$8\left(2-6b\right)+3$
$\frac{288x}{x^2-3x}$
$\frac{y}{x^3}=1$
$\lim_{x\to0}\left(\frac{1}{sin2x}-\frac{1}{2x}\right)$
$100x^2-81x^2y^4$
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