Find dydx\frac{dy}{dx}dxdy for y=x2+9y = \sqrt{x^2+9}y=x2+9.
xx2+9\frac{x}{\sqrt{x^2+9}}x2+9x
12x2+9\frac{1}{2\sqrt{x^2+9}}2x2+91
2xx2+9\frac{2x}{\sqrt{x^2+9}}x2+92x
x2x2+9\frac{x^2}{\sqrt{x^2+9}}x2+9x2