book Maths Puzzle Numerical Ability

log (1 + cos x + i sin x)/(cos x � 1 � i sin x)

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book Other Question

The half-life of Bismuth is 5 days. Then 75% of an original amount will cease to be radioactive in 10 days. I believe that this one is true. Am I right? A total of 691 tickets were sold for the school play. There were 59 fewer student tickets sold than adult tickets. How many adult tickets were sold?