$y'=12x\:y\left(\sqrt{2}\right)=-1$

$\frac{dy}{dx}=\frac{y+cos^2\frac{y}{x}}{x}$

$\lim_{n\to\infty}\left(1-sin\left(\frac{1}{8n}\right)\right)$

$-x^2+6x-13$

$16x^{2}+40x-27$

$x2\:+\left(2+a\right)x+2a;a=6$

$\lim_{x\to0}\left(\frac{2x-tan\left(x\right)}{\sqrt{x}}\right)$