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3sin(pi/9) - 4sin^(3)(pi/9) = ..........

`3sin(pi/9) - 4sin^(3)(pi/9) = .......`

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The correct Answer is:
`sqrt3/2`
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KUMAR PRAKASHAN-OBJECTIVE SECTION AS PER NEW PAPER SCHEME -Trigonometric Functions (Fill in the blanks)
  1. The value of (1-tan^(2)(15^(@)))/(1+tan^(2)(15^(@))) is ………..

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  2. If A +B + C = pi then secA (cos B cos C - sin B sin C) = .........

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  3. 3sin(pi/9) - 4sin^(3)(pi/9) = .......

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  4. One root of the equation 6x - 8x^3=sqrt3 is .........

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  5. (sin(3alpha))/(1+2cos(2alpha))= ..........

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  6. cos(47^@) cos (13^@) - sin (47^@) sin(13^@)= .........

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  7. sin((7pi)/(12))cos(pi/4)-cos((7pi)/(12))sin(pi/4)=...........

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  8. Sum of the measure of an angle of cyclic quadrilateral ABCD is ..........

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  9. Solution set of the equation 3 tan^(2) theta + 4 tan theta + 2 =0 is ....

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  10. For DeltaABC , sinA + sinB + sinC

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  11. In DeltaABC, m angleA = 90 , m angle B = 30 and a = 10^@ then b = .......

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  12. In DeltaABC if m angle C = 90^@ than tanA + tanB = ......(where a,b,c ...

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  13. Solution of the equation 2cos x + 1 = 0 is ...........

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  14. Height of the tower and multy storied building is same of 30 mets . Th...

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  15. .......is the angle of elevation of sun if height of building and its ...

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  16. At .........height one can reach by walking x mets with slope 30^@ and...

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  17. Radian value of 47^@ 30' is ......

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  18. 2 Radian = .......... Degree.

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  19. Arc at the circle with length 37.4 cm subtends and angle of 60^@ at ce...

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  20. Angle made by the the arc of length 55 cm at center is ......if length...

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