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In a triangle, sec A (cos B cos C-sin B...

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

A

`-1`

B

0

C

1

D

None of these.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. If sinx =1/3, then sin 3x is:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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