Verify that f = fx, for the function f(x,y) = 7x" + 3y> +2. For the function f(x.y) = 7x*+ 3y> + 2, fy= fx since fx =[ and f, = Therefore, fy = and f. yxFind the four second partial derivatives of the following function. 9 4 h(x,y)= x +xy + 6 h 7 2 = 72x dx 2 = 12xy 2 dy ah dy dx =Find the four second partial derivatives of the following function. f(x,y) =y cos 5x 3 xox = f. yy = fxy = fvx =Find the four second partial derivatives of the following function. 5x z = By e III Zyx = Z yY Z Xydz Use the Chain Rule to find dt , where z = 4x sin y, x=t*, and y = 5t-. dz (Type an expression using x and y as the variables.) dx dz dy dx at = =Verify that f =f for the following function. f(x, y) = ex X+y + 14 X+y + 14 f=Xty + 14 =1 yx