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The value of cos12^(@)cos24^(@)cos36^(@)...

The value of `cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos60^(@)cos72^(@)cos84^(@)` is :

A

`1//64`

B

`1//32`

C

`1//16`

D

`1//128`

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. If (tanalpha+tanbeta)/(cot alpha+cot beta)+{cos(alpha-beta)+1}^(-1)=1,...

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  2. Prove:cos(pi/15)cos((2pi)/15)cos((3pi)/15)cos((4pi)/15)cos((5pi)/15)co...

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  3. The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos60^(@)cos72^(@)cos...

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  4. The value of sin""(15pi)/(32)sin""(7pi)/(16)sin""(3pi)/(8), is

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  5. sum(r=1)^(n-1)cos^(2) (rpi)/2 is equal to

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  6. The value of cot theta-tantheta-2tan2theta-4tan4theta-8cot8theta, is

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  7. If cos(x-y) , cos x and cos (x+y) are in H.P. , then cos x. sec (y/2...

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  8. The value of tan20^(@)+2 tan50^(@)-tan70^(@), is

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  9. If cosA+cosB+cosC=0, then cos3A+cos3B+cos3C is equal to

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  10. The minimum value of cos 2 theta + cos theta for all real values of th...

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  11. cos9^@-sin9^@=

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  12. If y=(sin 3theta)/(sintheta), theta nen pi, then

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  13. about to only mathematics

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  14. about to only mathematics

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  15. 1+sinx+sin^(2)x+..."to"oo=2sqrt3 + 4, if x = ?

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  16. If sin(x-y)=cos(x+y)=1/2, the value of x and y lyingbetween 0^(@)and 9...

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  17. If alpha and beta be between 0 and (pi)/(2)and if cos(alpha+beta)=(12)...

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  18. If tan "" (alpha )/(2) and tan "" (beta)/( 2) are the roots of the eq...

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  19. 2x^(2) + 3x - alpha = 0 " has roots "-2 and beta " while the equation ...

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  20. If A+B+C=0, then the value of sum cot (B+C-A) cot (C+A-B) is equal to

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