A particle moves along x2+3y2=7x^2 + 3y^2 = 7x2+3y2=7. Find d2ydx2\frac{d^2y}{dx^2}dx2d2y at the point (2,1)(2, 1)(2,1).
−16/27-16/27−16/27
−7/27-7/27−7/27
16/2716/2716/27
−7/9-7/9−7/9