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Q. If a sum becomes Rs. 6480 in 3 years and Rs. 7776 in 4 years, interest being compounded annually, find the sum and rate of interest.
Wednesday, March 14, 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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