(Show solution) Find the second derivative of y by implicit differentation from the equation 4x^2 + 8y^2 - 36 64X 12 O - 9/4 y 13 32xy O (x12+10x- 1 ) / (X12+ 1) 12 O - 16 / 9 y13 A point at which the curve changes from concave upward to concave downward or vice-versa is called O Critical point Point of tangency O Point of Intersection Point of Inflection