question is on the picture below, thanks

3. CES...again Suppose we are given the constant returns-toscale CES production function, 1_ (a) Show that the marginal product of capital is equal to (i) p and the marginal product of labor is equal to (%)1_p 1P (b) Show that M RTS = (g) ; use this to show that the elasticity of substitution 0 = 1;. p (c) Determine the output elasticities fer k and l, and show that their sum equals 1