Which expression represents the derivative of y=1xy = \frac{1}{\sqrt{x}}y=x1?
−12x−3/2-\frac{1}{2}x^{-3/2}−21x−3/2
12x−1/2\frac{1}{2}x^{-1/2}21x−1/2
−12x1/2-\frac{1}{2}x^{1/2}−21x1/2
x−3/2x^{-3/2}x−3/2