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If in a triangle ABC a,b,c are roots of ...

If in a triangle `ABC` a,b,c are roots of the equation `x^3 - 11 x^2 + 38 x - 40 = 0` then `sum (cos A)/a` equal to:

A

`(3)/(4)`

B

`1`

C

`(9)/(16)`

D

None of these

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The correct Answer is:
C
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MOTION-SOLUTION OF TRIANGLE-EXERCISE - 2 (LEVEL I)
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  2. cot (A+B)/2.tan(A-B)/2= (a) (a+b)/(a-b) (b) (a-b)/(a+b)

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  3. In any triangle ABC,1-tan(A/2)tan(B/2)=

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  12. AD, BE and CF are the medians of triangle ABC whose centroid is G. If ...

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  13. Let 'l' is the length of median from the vertex A to the side BC of a ...

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  15. If the radius of the circum-circle of an isosceles triangle PQR is equ...

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  16. In a triangle ABC, if a=2,b=4,c=5 then cosA=

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  17. If in a triangle ABC a,b,c are roots of the equation x^3 - 11 x^2 + 38...

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  18. In a triangle A+B+C=90 then prove that cotA+cotB+cotC=cotAcotBcotC

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  19. If cos A=(sinB)/(2 sin C), then triangleABC is

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