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If C=60^(@), " then show that"(a)/(b+c)+...

If `C=60^(@), " then show that"(a)/(b+c)+(b)/(c+a)=1`

A

2

B

4

C

3

D

1

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1A
  1. In Delta ABC, if C=A-B=60^@, then the value of (a-b)/c=

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

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  3. If C=60^(@), " then show that"(a)/(b+c)+(b)/(c+a)=1

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  4. In Delta ABC, if C=60^@ then 1/(a+b)+1/(a+c)=

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  5. In Delta ABC, if C=60^@ then b/(c^2-a^2)+a/(c^2-b^2)=

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  6. In Delta ABC, if a/(b^2-c^2)+c/(b^2-a^2)=0 then B=

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  7. In Delta ABC, if B=90^@ then tan""A/2=

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  8. In Delta ABC, if C=90^@then (a^2+b^2)/(a^2-b^2)sin (A-B)=

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  9. In Delta ABC if 1/(b+c)+1/(c+a)=3/(a+b+c) then C=

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  10. In Delta ABC, if (a+b+c)(a+b-c) =3ab, then C=

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  11. In Delta ABC if A=60^@, then the value of (1+a/c+b/c)(1+c/b-a/b)=

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  12. In Delta ABC, (cos A)/(c sin B)+(cos B)/( a sin C)+(cos C)/( b sin A)=

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  13. In Delta ABC , if ( sin A)/(4) = (sin B)/(5) = (sin C)/( 6) then th...

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  14. In Delta ABC, if a:b:c=3:4:5, then sin A:sin B:sin C=

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  15. In a /\ABC, if a:b:c = 7:8:9, then find cosA:cosB:cosC.

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  16. In Delta ABC if b+c:c+a:a+b=11:12:13, then cos A: cos B: cos C=

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  17. In Delta ABC, if cos A=17//22, cos C =1//14, then a:b:c=

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  18. In Delta ABC, if cot""A/2:cot""B/2:cot""C/2=3:7:9, then a:b:c=

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  19. In Delta ABC, if tanA: tan B: tan C=1:2:3, then sin A: sin B: sin C=

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  20. In a triangle ABC, (s-a)/11=(s-b)/12=(s-c)/13, then tan^2 (A//2)=

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