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cosx+cosy=a and sinx+siny=b show that

  1. 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 667 views
  2. cosx+cosy=a and sinx+siny=b show that sin2x+sin2y=2ab(1-(2/(a^2+b^2))plz plz show step
    1. answers icon 7 answers
    2. maths asked by maths
    3. views icon 1,901 views
  3. 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 1,278 views
  4. 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 555 views
  5. 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 1,619 views
  6. Angles x and y are located in the first quadrant such that sinx=3/5 and cosy=5/13.a) Determine an exact value for cosx. b)
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 1,684 views
  7. Angles x and y are located in the first quadrant such that sinx=3/5 and cosy=5/13.a) Determine an exact value for cosx b)
    1. answers icon 2 answers
    2. Anonymous asked by Anonymous
    3. views icon 1,362 views
  8. if f(x)=sinx, show that f(x+y)-f(x)=cosx siny-2sinx sin^2(y/2)
    1. answers icon 1 answer
    2. John Rey asked by John Rey
    3. views icon 344 views
  9. Simplify #3:[cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [cosx-(sin90cosx-cos90sinx)sinx]/[cosx-(cos180cosx+sinx180sinx)tanx] =
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 1,086 views
  10. 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 1,429 views