$\lim_{x\to0}\left(\frac{9^x-5^x}{9x}\right)$
$\lim_{x\to-3}\left(\frac{6x^3+18x^2}{x+3}\right)$
$\cos\left(c\right)^4-\sin\left(c\right)^4+1=2\cos\left(c\right)^2$
$9x^2-30x+425$
$y^3-3y^2$
$\left(x-y\right)^2=\left(x^2+2xy+y^2\right)$
$1-x-2x^2$
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