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In Delta ABC , if A,B , C are in A.P. T...

In `Delta ABC , if A,B , C are `in A.P. The ` (a+c)/( sqrt(a^(2) -ac + c^(2))`

A

` cos ((A-C)/( 2)) `

B

`sin ((A-C)/( 2)) `

C

`2 cos ((A-C)/( 2)) `

D

`2 sin ((A-C)/( 2)) `

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. ( b+c) cos A + ( c+a) cos B +( a+b) cos C =

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  2. In Delta ABC , if a( b cos C + c cos B ) = 2ka^(2) , then k=

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  3. In Delta ABC , if A,B , C are in A.P. The (a+c)/( sqrt(a^(2) -ac + ...

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  4. InDelta ABC , a( b cos C - c cos B) =

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  5. In Delta ABC , (sin A(a- b cos C))/( sin C ( c-b cos A)) =

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  6. If a,b,c are in A.P. Then cos "" ( A-C)/( 2) cosec ""(B)/(2) =

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  7. In Delta ABC , b = sqrt 3+ 1 , c sqrt3-1 and angle A = 60 ^(@) the...

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  8. If C = A - B = 60 ^(@) " then " (a-b)/ (c )=

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

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

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

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

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

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

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

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

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

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

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

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

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