関連ワード:  second derivative of sqrt x    second derivative of sqrt x 2 1    second derivative of sqrt x 1    second derivative of sqrt(x+3)    second derivative of sqrt(x/2)    second derivative of sqrt x^5    second derivative of sqrt(x^2+y^2)    second derivative of sqrt(4+x)    second derivative of sqrt(x-16)    second derivative of square root of x