Ask a New Question
Menu

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)
    1. answers icon 1 answer
    2. celina asked by celina
    3. views icon 922 views
  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
    3. views icon 465 views
  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
    1. answers icon 1 answer
    2. Binoy kumar mahato asked by Binoy kumar mahato
    3. views icon 2,370 views
  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
    3. views icon 563 views
  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 540 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 1,509 views
  7. Prove that:sin(x+2y)+sin(y+2z)+sin(z+2x)=4sin(x-y)/2sin(y-z)/2sin(z-x)2
    1. answers icon 1 answer
    2. Rabin asked by Rabin
    3. views icon 494 views
  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 743 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
    1. answers icon 0 answers
    2. anoynomous asked by anoynomous
    3. views icon 468 views
  10. If A + B + C = π, prove that: ( sin2A + sin2B + sin2C ) / ( sinA + sinB + sinC ) = 8 sin(A/2) sin(B/2) sin(C/2)
    1. answers icon 2 answers
    2. manish asked by manish
    3. views icon 964 views