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18. Given 2 logs (x + y) = 2 + log; x + log; y, show that x* + yz = 7xy. (3 marks) 19.

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18. Given 2 logs (x + y) = 2 + log; x + log; y, show that x* + yz = 7xy. (3 marks) 19. Given w/x3 + In(3x - 5y?) , find the partial differentiation for x and y. (6 marks)22. A rope of 40cm long is bent into the shape of a rectangle. Find the maximum rectangle area that can be enclosed. (5 marks]

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