given theta=π/2^n+1
to prove 2^ncostheta×cos2theta×cos2^2theta... cos2^(n-1) theta=1
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Answer:
=2n-3sinq2sin.4q cos 4q.. cos2 2tq
=sin2nq con q
=sin(^-q)sinq
=sinq sin=1
Answer is =1
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