Find f′(x)f'(x)f′(x) for f(x)=cos(x)f(x) = \cos(\sqrt{x})f(x)=cos(x).
−sin(x)/(2x)-\sin(\sqrt{x}) / (2\sqrt{x})−sin(x)/(2x)
sin(x)/(2x)\sin(\sqrt{x}) / (2\sqrt{x})sin(x)/(2x)
−sin(x)-\sin(\sqrt{x})−sin(x)
None