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If theta=pi/(2^n+1) , prove that: 2^ncos...

If `theta=pi/(2^n+1)` , prove that: `2^ncosthetacos2thetacos2^2 cos2^(n-1)theta=1.`

A

1

B

0

C

`1//2`

D

none

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A
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ML KHANNA-TRIGONOMETRY RATIOS AND IDENTITIES-PROBLEM SET (5) ( MULTIPLE CHOICE QUESTIONS)
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  5. sin 6^(@) sin 42^(@) sin66^(@) sin 78^(@) =

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  7. sin 36^(º)sin 72^(º) + 108^(º) sin 144^(º) =

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  19. If theta=pi/(2^n+1) , prove that: 2^ncosthetacos2thetacos2^2 cos2^(n-1...

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