$\lim_{x\to0}\left(\frac{7x-sinx}{x^3}\right)$
$5y^2-13y-6$
$2x^5-32x$
$\frac{2x^2-x+1}{x}$
$x-9\cdot64x-1$
$cosx\left(secx\:-\:senx\right)=cos^2x$
$\left(\frac{x^3-27}{a-1}\right)\left(\frac{a^2+a+1}{x^2+3x+9}\right)$
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