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Should you find theta? (II)

xn=2ncosnθ\large x_n=2^n \cos n\theta

For the given sequence we know that x2=289\large x_2=-\frac{28}{9} and x3=18427.\large x_3=- \frac{184}{27}.

If x5=AB,x_5=\dfrac{A}{B}, where AA and BB are coprime positive integers, find A+B.A+B.

See Part 1.


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