Calculate the derivative of f(x)=sinxxf(x) = \frac{\sin x}{x}f(x)=xsinx.
(xcosx−sinx)/x2(x\cos x - \sin x) / x^2(xcosx−sinx)/x2
cos(x)/1\cos(x) / 1cos(x)/1
(xcosx+sinx)/x2(x\cos x + \sin x) / x^2(xcosx+sinx)/x2
cos(x)\cos(x)cos(x)