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cos A cos 2A cos 4A .......cos^(2^(n-1))...

`cos A cos 2A cos 4A .......cos^(2^(n-1))A=`

A

`(sin 2 ^(n)A)/(2^(n)sin A)`

B

`(2 ^(n) sin 2^(n)A)/(sin A)`

C

`(2^(n)sin A)/(sin 2 ^(n)A)`

D

`(sin A)/(2^(n) sin 2 ^(n)A)`

Text Solution

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The correct Answer is:
A
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SIA PUBLICATION-TRIGONOMETRIC RATIOS -PROBLEMS
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  2. (cos x )/( cos (x-2y))= lambda implies tan(x-y) tan y=

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  3. cos A cos 2A cos 4A .......cos^(2^(n-1))A=

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  4. sqrt3 cosec 20^(@) -sec 20^(@) is equal to

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  5. If A=35^(@) , B= 15^(@) and C=40^(@) , then tan A* tan B+ tan B* tan...

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  6. If tan theta + tan ( theta + (pi)/(3))+ tan ( theta + (2pi)/(3))=3 , ...

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  7. If alpha + beta + gamma = 2 theta , " then " cos theta + cos ( theta...

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  8. If 'theta' lies in the first quadrant and 5 tan theta=4, then (5 sin t...

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  9. If cos (A -B) =5/3,tan A tan B =2, then which one of the following is ...

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  10. The value of (tan 80^@ - tan 10^(@))/( tan 70^(@))

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  11. sin A + sin B = sqrt(3) ( cos B- cos A )implies sin 3A + sin 3B=

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  12. sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

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  13. "cosec" 15^(@) + sec 15^(@) =

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  14. If 5 cos x+ 12 cosy=13 , then the maximum value of 5sin x+ 12 sin y i...

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  18. A+C=2B implies ( cos C - cos A )/( sin A - sin C )=

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