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cos 20^(@)* cos 40^(@) * cos 60^(@) * co...

`cos 20^(@)* cos 40^(@) * cos 60^(@) * cos 80^(@) = `

A

`1//16`

B

`3//16`

C

`1//32`

D

`1//8`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
  1. sin 12^(@) * sin 24^(@) * sin 48^(@) * sin 84^(@) =

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  2. sin 20^(@) * sin 40^(@) * sin 60^@ * sin 80^(@) =

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  3. cos 20^(@)* cos 40^(@) * cos 60^(@) * cos 80^(@) =

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  4. cos 6^(@) * cos 42^(@) * cos 60^(@) * cos 66^@ * cos 78^@=

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  5. sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) sin 90^(@)=

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  6. Prove that cos^(2)76^(@)+cos^(2)16^(@)-cos76^(@)cos16^(@)=(3)/(4)

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  13. ( cos A + cos 3A + cos 5A + cos 7A )/( sin A + sin 3A + sin 5A + sin 7...

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