Prove Eulers theorem that, if ( L , K ) is homogeneous of degree(see Exercise 5.7), then L ( / L )+ K

Prove Euler’s theorem that, if ƒ(L, K) is homogeneous of degree γ (see Exercise 5.7), then L(∂ƒ/∂L) + K(∂f/∂K) = γƒ(L, K). Given this result, what can you conclude if a production function has constant returns to scale? Express your results in terms of the marginal products of labor and capital.