Q3 The implicit function U=U(A,B), shows what combinations of apples (A) and bananas (B) provide the level of utility U. The absolute value of the slope of the indifference curve is the marginal rate of substitution (MRS), which measures the rate at which one good can be substituted for another while maintaining the same level of utility. Find the derivative of the implicit function to determine the MRS of apples for bananas (MRSAB) for each utility function. (a) U=AB (b) U=A0.25B0.75