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In a Delta ABC, the side a, b, and c a...

In a `Delta ABC,` the side a, b, and c are such that they are roots of `x^(3) -11x ^(2) +38x -40=0.` Then the value of `(cos A)/(a )+ (cos B)/(b)+ (cos C)/(c ).`

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The correct Answer is:
`((9)/(16))`
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ARIHANT MATHS-PROPERTIES AND SOLUTION OF TRIANGLES -Exercise (Subjective Type Questions)
  1. In an obtuse angled triangle, the obtuse angle is (3pi)/4 and the othe...

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  2. In a delta ABC, a,c, A are given and b(1) , b(2) are two values of thi...

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  3. If P is a point on the altitude AD of the Delta ABC, such that angle C...

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  4. If R denotes circumradius, then in DeltaABC,(b^2-c^2)/(2aR) is equal t...

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  5. In DeltaABC, A=(2pi)/(3), b-c=3sqrt3 cm and are (DeltaABC) =(9sqrt3)/(...

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  6. If Delta = a^(2)-(b-c)^(2), Delta is the area of the Delta ABC then ta...

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  7. In a DeltaABC, B=90^(@), AC=h and the length of perpendicular from B t...

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  8. If in a Delta ABC, sin ^(3) A + sin ^(3) B+ sin ^(3) C =3 sin A .Sin...

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  9. In a Delta ABC, the side a, b, and c are such that they are roots of...

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  10. If the sides a,b,c are in A.P., prove that (tan)A/2+ (tan) c/2=2/3( co...

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  11. The side of a Delta are in AP. And its area is 3/5xx (area of an equil...

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  12. If AD, BE and CF are the medians of a Delta ABC, then evaluate (AD^(2)...

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  13. AD is a median of the Delta ABC. If AE are medians of the Delta ABD a...

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  14. In DeltaABC, If x= tan((B-C)/2) tan(A/2),y= tan((C-A)/2)tan(B/2), ta...

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  15. In the given figure DeltaABC is equilateral on side AB produced. We ch...

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  16. The base of a triangle is divided into three equal parts. If theta(1),...

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  17. If the circumradius of a triangle is 54/sqrt1463 and the sides are in...

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  18. If the angle at the vertex of an isosceles triangle having the maximum...

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  19. In an acute angle triangle ABC, AD, BE and CF are the altitudes, then ...

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  20. Let P be the point inside that Delta ABC. Such that angle APB=angle BP...

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