$\lim_{x\to0}\left(\frac{6x^2-13x+2}{2x^2}\right)$

$x^2-9a^46a^2b+1+2x-b^2$

$\sen^{2}a-\sen^{2}a\cos^{2}a=\sen^{4}a$

$\frac{-3x^4\:+6x^3\:-12x^2}{3x^2}$

$\sqrt{11x+\sqrt{11x+\sqrt{11x}}}$

$\frac{dy}{dx}\left(\frac{x^2+2x}{e^x}\right)$

$\left(1\right)\left(-54\right)+\left(-12\right)$