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sin 20^(@) sin 40^(@) sin 60^(@) sin 8...

sin `20^(@) ` sin `40^(@)` sin `60^(@)` sin `80^(@) =(3)/(16)`

A

`- 3//16`

B

`5//16`

C

`3//16`

D

`- 1//16`

Text Solution

Verified by Experts

The correct Answer is:
C
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ML KHANNA-TRIGONOMETRY RATIOS AND IDENTITIES-PROBLEM SET (5) ( MULTIPLE CHOICE QUESTIONS)
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  2. The value of cos ( pi //5) cos ( 2pi //5) cos ( 4pi //5) cos ( 8pi //5...

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  3. sin 20^(@) sin 40^(@) sin 60^(@) sin 80^(@) =(3)/(16)

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  4. The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to

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  5. tan 20^(@)" " tan 40^(@)" " tan 60^(@)" " tan 80^(@)=

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  6. cos^6pi/9-33tan^4pi/9+27tan^2pi/9 is equal to 0 (b) sqrt(3) (c) 3 ...

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  7. Prove that"sin"(pi)/(14)"sin"(3pi)/(14)"sin"(5pi)/(14)"sin"(7pi)/(14)=...

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  8. The value of sin""(pi)/(14).sin""(3pi)/(14).sin""(5pi)/(14).sin""(7pi)...

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  9. sin 12^(@) sin 48^(@) sin 54^(@) is equal to

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  10. sin 6^(@) sin 42^(@) sin66^(@) sin 78^(@) =

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  11. Prove that cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)

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

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  13. cos "" (pi )/( 65) cos "" ( 2pi )/( 65)cos"" ( 4pi )/( 65) cos "" ( 8 ...

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  14. If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

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  15. The value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) is

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  16. cos 60^(@) cos 36^(@) cos 42^(@) cos 78^(@) is

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  17. Value of sin 47^(@) + sin 61^(@)- sin 11 ^(@)-sin 25 ^(@) is

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  18. The value of sin"" (pi )/( 18) sin"" ( 5pi )/(18) sin"" ( 7pi )/( 18) ...

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  19. cos""(2pi)/(15)cos""(4pi)/(15)cos""(8pi)/(15)cos""(16pi)/(15)=(1)/(16)

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  20. The value of cos "" (pi)/( 15) cos "" (2pi )/( 15)cos "" ( 3pi )/( 15)...

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