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

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

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If A= 60 ^(@) " then " ( b) / ( c+ a) + ( c ) /( a+ b) =

If A = 60 ^(@) " then " ( 1)/(a+b) + (1) /( a+ c) =

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If C = A - B = 60 ^(@) " then " (a-b)/ (c )=

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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - 9.1 ( LONG ANSWER QUESTIONS)
  1. If the angles are in the ratio 1: 5: 6, then find the ratio of its sid...

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  2. If a:b: c = 7: 8: 9 find cos A : cos B : cos C

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

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  4. If C = 60 ^(@) then show that (b)/( c^(2) -a^(2)) + (a)/( c^(2) ...

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  5. In DeltaABC, " if" (1)/(a+c)+(1)/(b+c)=(3)/(a+b+c) then show that C=...

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  6. In DeltaABC" show that "suma^(3)cos(B-C)=3abc

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  7. a^(2) cot A + b^(2) cot B + c^(2) cot C "" ( abc)/( R)

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  8. a cos ^(2) "" ( A) /(2) + b cos ^(2) "" ( B)/(2) = c cos ^(2) "" ( C...

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  9. b^(2) sin 2C + C^(2) sin 2B = 2 b sin A

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  10. In a /\ABC if a^(2)+b^(2)+c^(2)=8R^(2) then show that/\ABC is a right ...

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  11. If cos ^(2) A + cos ^(2) B = cos ^(2) C = 1 then show that Delta A...

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  12. If cot.(A)/(2)=(b+c)/(a) find angle B

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  13. Show that cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2)...

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  14. In DeltaABC,(cot(A//2)+cot(B//2)+cot(C//2))/(cotA+cotB+cotC)=

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  15. Prove that tan.(A)/(2)+tan.(B)/(2)+tan.(C)/(2)=(bc+ca+ab-s^(2))/(Delta...

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  16. In DeltaABC show that (a+b+c)(tan.(A)/(2)+tan.(B)/(2))=2cot.(C)/(2)

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  17. If sin theta = a/(b+c) then show that cos theta = (2sqrt(bc))/(b+c) co...

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  18. If a = (b-c) "sec" theta, then prove that tan theta = (2sqrt(bc))/(b-c...

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  19. If cot.(A)/(2)+cot.(B)/(2)+cot.(C)/(2) are in A.P , then prove that a,...

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  20. If tan ""(A)/(2) = (5)/(6) , tan "" (B)/(2) = ( 20 )/( 37) then s...

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