Problem 50 +17 48. Which of the following is equal to y X 1 a) x+y 2 b) Xy x+y d) ху X 49. Which of the following is equal to a) 1 b) 2 x2+y2 C) xy ху X+2 50. Which of the following is equal to 2x 1 х X12 1 a) 2X X = Xr2 2(1) X+1 b) x 2X 2X-1 c) X =Xt2 2 Xt2-1 2x d) 2X 2X X 2X 2 alX

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