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Bibha said to Bigyata," I'm twice as old as you were when I was as old as you are.". If the sum of their present age is 35 years. Find the present ages.
Sunday, February 25, 2018
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Soln: Use formula: cos2A = 2cos^2(A) - 1 cos2A+1= 2cos^2(A) (1+cos2A)/2 = cos^2(A) i.e. cos^2(A) = (1+cos2A)/2
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