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The annual compound interest on a sum of money in 2 years and 3 years are Rs. 210 and Rs. 331. Find the interest rate and principal.
Friday, January 12, 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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