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the value of cos(pi)/(2^2),cos(pi)/(2^3)...

the value of `cos(pi)/(2^2)`,`cos(pi)/(2^3)`,`cos(pi)/(2^4)` .`cos(pi)/(2^(10))`,`sin(pi)/(2(10))` is (a) `(1)/(1024)` (b) `(1)/(512)` (c) `(1)/(256)` (d) `(1)/(128)`

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