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ifcosX+cosY=a and sinX+sinY=b than prove

  1. ifcosX+cosY=a and sinX+sinY=b than prove thatsin2X+sin2Y=2ab(1-2/(a^2+b^2)
    1. answers icon 5 answers
    2. Binoy kumar mahato asked by Binoy kumar mahato
    3. views icon 4,373 views
  2. sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y)prove this identity
    1. answers icon 0 answers
    2. JK asked by JK
    3. views icon 1,267 views
  3. How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form of 1/2(sin2x + sin2y)?
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 651 views
  4. Ok, i've tried this question, and it brings me to no answers. Please help!Prove the following: secY(1+tanY)=6cosecY my workings:
    1. answers icon 1 answer
    2. help! asked by help!
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  5. Prove that (cosy/1+siny) + (1+siny/cosy) = 2secy
    1. answers icon 1 answer
    2. Trig asked by Trig
    3. views icon 1,491 views
  6. Simplify:sin(x-y)cosy+cos(x-y)siny = (sinxcosy-cosxsiny)cosy+(cosxcosy+sinxsiny)siny = ??? What do I do next??? Please Help and
    1. answers icon 4 answers
    2. Anonymous asked by Anonymous
    3. views icon 1,420 views
  7. 2tan^-1(tanx/2×tan(π/4-y/2))=tan^-1(sinx×siny/cosx+cosy)
    1. answers icon 1 answer
    2. Mansi asked by Mansi
    3. views icon 546 views
  8. Okay, I've been getting some of these, but I can't seem to verify this identity... any help? Here's the problemSin(x+y) +
    1. answers icon 2 answers
    2. Alex asked by Alex
    3. views icon 700 views
  9. please solve these if possibleQ1. If sinx +siny=3(cosy-cosx) then the value of sin3x/sin3y. Q2. If sina ,cosa,and tan a are in
    1. answers icon 3 answers
    2. marley asked by marley
    3. views icon 1,605 views
  10. what is the derivative of sinx- cosy = 0 in its simplest form? I got to the point y'=-consx/siny, but I wasn't too sure. This
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    2. lil asked by lil
    3. views icon 1,359 views