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If sinx =1/3, then sin 3x is:...

If `sinx =1/3`, then sin 3x is:

A

`23/27`

B

`-23/27`

C

`sqrt(23/27)`

D

`(4 sqrt2)/9`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. The equations sin t=1/4, cos t= 3/4 have:

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  2. The maximum value of 5 cos theta +3 cos (theta + pi/3)+3 is :

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  3. If sinx =1/3, then sin 3x is:

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  4. In a triangle, cosec A (sin B cos C + cos B sin C) is equal to :

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  5. In a triangle, sec A (cos B cos C-sin B sin C) is equal to :

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  6. If sin theta= sin alpha, then the value of sin frac (theta)(3) is:

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  7. cos 52^@+ cos 68^@+ cos 172^@ is equal to :

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  8. The value of cos 52^@ + cos 68^@ + cos 172^@ is:

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  9. If in two circles, arcs of the same length subtend angles 60^@ and 75^...

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  10. If in two circles, arcs of the same length subtend angles 60^@ and 75^...

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  11. The minimum value of (cos theta+ sin theta) is:

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  12. If tan theta=1/2 and tan phi=1/3, then the value of (theta + phi) is :

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  13. The period of the function sin 3x is:

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  14. The period of the function f(x) = cos 4x + tan 3x is :

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  15. The number of points of intersection of 2y-1=0 and y = sinx,-2 pi lexl...

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  16. The expression (cos 2b-cos 2a)/(sin 2b-sin2a) is equal to:

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  17. If tan x=b/a, then the value of a cos 2x+b sin 2x is :

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  18. If sin 5theta = cos 4theta where 5theta and 4theta are acute angles, f...

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  19. If 2 sin theta=a+1/a, a is real, then the solution set for a is :

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  20. The maximum value of a cos x + b sin x is :

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