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

In ` Delta ABC, if a = 6, b=3 and cos (A-B) = (4)/(5) " then " angle C = `

A

` (pi)/(4) `

B

` ( pi)/(3) `

C

` (pi)/(6) `

D

` (pi)/(2) `

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The correct Answer is:
D
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. If C = A - B = 60 ^(@) " then " (a-b)/ (c )=

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  2. In Delta ABC , if tan ""( A)/(2) = t cot ""(( B- C)/( 2)) , " the...

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  3. In Delta ABC, if a = 6, b=3 and cos (A-B) = (4)/(5) " then " ang...

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  4. In Delta ABC , if a= 2b and A = 3B " then " A =

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  5. In Delta ABC ( tan ""(A)/(2) - tan ""(B) /(2)) /( tan ""(A)/(2) +t...

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  6. If a= 3, b=4, c= 5 then sin ""( A)/(2) =

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  7. In DeltaABC , " find " b cos ^(2).(C)/(2)+c cos^(2).(B)/(2)

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  8. (a+b+c)/( a+b+c) =

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  9. If a= 5 , b-=12 , c=13 then tan ""(A)/(2) =

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  10. If a= 3, b =4 , c = 5 then cos ""( A)/(2) =

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  11. In Delta ABC , if a = 5 , b= 6 and c= 7 " then " cos ^(2) C //2 =

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  12. In Delta ABC , if angle A = 60 ^(@) then ( 1+ (a)/(c ) +(b) /...

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  13. Show that cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2)...

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  14. ((a^(2))/( sin A)+( b^(2))/(sin B) + ( c^(2))/( sin C) ) ( sin ""(A)/...

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  15. In Delta ABC ,(a+b+c) (tan ""(A)/(2) +tan ""(B)/(2) ) tan "" ( C) /...

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  16. In Delta ABC , if c= (a+b) sin theta and cos theta = ( k sqrt (ab))...

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  17. In Delta ABC , c cos ^(2) "" ( A)/(2) +a cos ^(2) "" ( C ) /(2) i...

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  18. In Delta ABC , a sin ^(2) "" ( C ) /(2) + c sin ^(2) "" (A ) /(2) ...

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  19. In Delta ABC , tan "" (A)/(2) , tan "" (B)/(2) are in H.P. A,b,c ...

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  20. In Delta ABC , if (a)/( c ) = (sin (A-B))/( sin (B-C)) , " then " ...

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