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In Delta ABC , if ( sin A)/(4) = (sin B...

In ` Delta ABC , if ( sin A)/(4) = (sin B)/(5) = (sin C)/( 6) ` then the value of cos A +cos B +cos C =

A

`(23)/( 15) `

B

` ( 23)/(16) `

C

` ( 23)/(14) `

D

` ( 14)/(23)`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
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  5. Cot A +Cot B +cot C =

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  6. If 4,5 are two sides of a triangle and included angle 60 ^(@) , ...

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  7. Area of triangle is 75 cm^(2) and two of its sides 20 cm, 15cm ,t...

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  11. Two angles of a triangles are (pi)/(6) and (pi)/(4) included si...

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  12. If in Delta ABC, b-c = 3sqrt3 , A= 120 ^(@) and the area of Delt...

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  13. In Delta ABC , ( bc cos A + c a cos B + ab cos C) /( cot A + cot B ...

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  14. If a = 5, b= 12 ,c = 13 then R =

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  15. If a cos A = b cos B then triangle ABC is

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  16. In Delta ABC , sum a (sin B - sin C)

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  17. In Delta ABC, sum a .sin (B-C)=

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  19. In Delta ABC , R^(2) ( sin 2A +sin 2B+ sin 2C) =

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