(h) be the function of two variables (a) If, in addition, x=r cost and y=r sint, find the value of when (r₁ +) = (2, III). 2+ Such that 2 f (x,y) = < 3x²-3y - 3x + 3y²) and f(2,1)=40 line anation of at (21) b estimate the value

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