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If in two circles, arcs of the same leng...

If in two circles, arcs of the same length subtend angles `60^@` and `75^@` at the centre, find the ratio of their radii.

A

`3/4`

B

`4/3`

C

`sqrt3/2`

D

`9/16`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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  2. The value of cos 52^@ + cos 68^@ + cos 172^@ is:

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

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

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

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

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

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

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

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

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

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

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

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

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  15. If in a DeltaABC, sin A =sin^(2) B and 2 cos ^(2)A=3 B, then the Delta...

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  16. If the angle opf a triangle are in the ratio 1:2:3, then show that the...

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  17. If in a triangle, a/(cosA)= b/(cos B) =c/(cos C), then the triangle is...

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  18. Let the angles A, B, C of triangle ABC be in A.P. and let b:c= sqrt3:s...

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  19. The period of sin 2 theta is :

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  20. If y = sec^2 theta+ cos^2 theta, theta ne 0, then :

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