関連ワード:  second derivative of root x 1    second derivative of sqrt(x-16)    second derivative of sqrt 1 x 2    second derivative of 1 root 1 x 2    2nd derivative of 1/sqrt x    second derivative of sqrt x )+ sqrt y )= 1    second derivative of square root of x^2+1    second derivative of root x    2nd derivative of square root of x    second derivative of x^1/2