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prove that: sinC+sinD =2sin((C+D)/2)*cos((C-D)/2)

  1. prove that:sinC+sinD =2sin((C+D)/2)*cos((C-D)/2)
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    2. celina asked by celina
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  2. riangular flower garden ABC in which AB = 4m, BC = 5and ∠BCA =30. Point D lies on AC such that BD = 4 m and ∠BDC is obtuse.F
    1. answers icon 1 answer
    2. King asked by King
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  3. if cos(B-C)+cos(C-A)+cos(A-B)=-3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that
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    2. Binoy kumar mahato asked by Binoy kumar mahato
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  4. Given that triangle ABC with sides a, b, and c, show that the area of the triangle is given byA =
    1. answers icon 0 answers
    2. KnowsNothing asked by KnowsNothing
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  5. Prove the law for triangle ABC i.e sin A/a=sinB/b=sinC/c Please help me!
    1. answers icon 1 answer
    2. Meron asked by Meron
    3. views icon 521 views
  6. Prove:sin2x / 1 - cos2x = cotx My Attempt: LS: = 2sinxcosx / - 1 - (1 - 2sin^2x) = 2sinxcosx / - 1 + 2sin^2x = cosx / sinx - 1 =
    1. answers icon 5 answers
    2. Anonymous asked by Anonymous
    3. views icon 1,480 views
  7. Prove that:sin(x+2y)+sin(y+2z)+sin(z+2x)=4sin(x-y)/2sin(y-z)/2sin(z-x)2
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    2. Rabin asked by Rabin
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  8. Prove the law of sines for triangle ABC i.e sinA/a=sinB/b=sinC/c.0 please help me!!!
    1. answers icon 1 answer
    2. Meron asked by Meron
    3. views icon 717 views
  9. A and B are two different values of C lying between 0 and 360 which satisfy the equation (p cosC + q sinC=r) then prove that
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    2. anoynomous asked by anoynomous
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  10. If A + B + C = π, prove that: ( sin2A + sin2B + sin2C ) / ( sinA + sinB + sinC ) = 8 sin(A/2) sin(B/2) sin(C/2)
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    2. manish asked by manish
    3. views icon 939 views