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In DeltaABC, if the sides a,b,c are the ...

In `DeltaABC`, if the sides a,b,c are the roots of `x^(3)-11x^(2)+38x-40=0` then the value of `(cosA)/(a)+(cosB)/(b)+(cosC)/(c)=`

A

`(3)/(4)`

B

`(9)/(16)`

C

`(9)/(8)`

D

1

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The correct Answer is:
B
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AAKASH SERIES-REVISION EXERCISE-PROPERTIES OF TRIANGLES
  1. If a=4,b=5,c=6 then

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  2. In DeltaABC, if a= 2, b= sqrt(6) and c= sqrt(3)+1 then A=

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  3. In DeltaABC, if the sides a,b,c are the roots of x^(3)-11x^(2)+38x-40=...

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  4. In triangle ABC, triangle A^(1)B^(1)C^(1) are such that B=B^(1),A+A^(1...

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  5. In triangle ABC, right angle at B if s-a=3, s-c=2 then a,c are

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  6. The distance of the orthocentre from the vertices A,B,C are in the rat...

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  7. If H is the orthocentre of DeltaABC and AH=x, BH=y, CH=z then (abc)/(x...

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  8. If the angles A,B,C of a triangle are in A.P and sides a,b,c are in G....

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  9. In triangle ABC, range of (a^(2)+b^(2)+c^(2))/(ab+bc+ca) is (a,b,c are...

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  10. In DeltaABC, if AD is the altitude and O is the orthocentre of DeltaAB...

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  11. If R is the circumradius of equilateral traingle DeltaABC then circumr...

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  12. If alpha, beta, gamma are lenghts of internal bisectors of angles A,B,...

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  13. In DeltaABC, a=2b,|A-B|=(pi)/(3) then angle C=

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  14. In Delta ABC , if x=tan((B-C)/(2))tan.(A)/(2),y=tan((C-A)/(2))tan.(B)/...

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  15. In a triangle ABC, D and E are the mid-points of BC, CA respectively. ...

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  16. The alternate vertices of a regular hexagon are joined to form another...

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  17. In DeltaABC if r(1)=2r(1)=3r(3) and D is the mid point of BC then cos ...

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  18. If (sin 3B)/(sinB)=((a^(2)-c^(2))/(2ac)) then a^(2),b^(2),c^(2) are in

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  19. In DeltaABC if r(1)=R then

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  20. IF Delta ABC,if a tan A+b tan B=(a+b) tan ((A+B)/2), then the triangle...

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