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In Delta ABC, if : a = 6, b = 3, cos (A ...

In `Delta ABC`, if : `a = 6, b = 3, cos (A - B) = 4//5`, then : its area =

A

7sq. units

B

8sq. units

C

9sq. units

D

none of these

Text Solution

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The correct Answer is:
C
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - B : MASTERING THE BEST
  1. In Delta ABC, if : a = 2, b = 3 and sin A = 2//3, then : /B =

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  2. In Delta ABC, if : a = 5, b = 4, A = pi/2 + B, then : /C =

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  3. In Delta ABC, if : A = 30^(@), C = 60^(@), a =sqrt(2) then b and c

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  4. If, in a Delta ABC, angle C is 45^(@) then : (1 + cot A) (1 + cot B)...

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  5. If DeltaABC is a right angled at C, then tan A + tan B is equal to

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  6. If a = 7, b = 4sqrt(3) and c = sqrt(13), then the smallest angle of De...

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  7. In a Delta ABC, if b=20, c=21and sin A =3/5, then the value of a is

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  8. In Delta ABC, if: b = sqrt(3), c = 1 and A = 30^(@), then the largest ...

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  9. The lengths of the sides of a triangle are alpha-beta, alpha+beta and ...

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  10. In Delta ABC, if : 2s = a + b + c, then: (s(s - a))/(bc) =

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  11. If Delta ABC, if : a = 2, b = 4, C = 60^(@), then : (A, B) =

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  12. In Delta ABC, if : A = 60^(@), a = 5, b = 4sqrt(3), then B =

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  13. If, in a Delta ABC right angled at B, it is given that s - a = 3 and s...

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  14. If, in a Delta ABC, b^(2) + c^(2) = 3a^(2), then : cot B + cot C - c...

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  15. I nDeltaA B C ,1-tan(A/2)tan(B/2)=

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  16. In a /\ABC, if A,B,C are in A.P., then: a/c (sin 2C) + c/a (sin 2A) ...

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  17. In Delta ABC, if : a^(2), b^(2), c^(2) are in A.P., then : (sin 3B) : ...

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  18. In Delta ABC If: 2(cosA)/a + (cos B)/(b) + 2(cosC)/(c) = a/(bc) + b/...

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  19. Area of the triangle is 10sqrt3 sq. cm, /C = 60^@ and its perimeter is...

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  20. In Delta ABC, if : a = 6, b = 3, cos (A - B) = 4//5, then : its area =

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