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In the survey between 54 peoples the ratio of playing football and volley ball is 5:4.18 people like both games from venn diagram find the number of people who play football. One person should like one games.
Saturday, January 20, 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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