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giving that cosx=4/5 and siny=12/13,

  1. giving that cosx=4/5 and siny=12/13, find cos(x+y) when x is acute and y is obtuse angle
    1. answers icon 2 answers
    2. edward damia asked by edward damia
    3. views icon 474 views
  2. 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
  3. (Cosx)^y=x^siny find dy/dx at point pi/(4,0)
    1. answers icon 2 answers
    2. Collins asked by Collins
    3. views icon 462 views
  4. If siny=cosx, then find dy/dx at the point (pi/2, pi)A. -1 B. 0 C. 1 D. pi/2 E. None of these I got C
    1. answers icon 2 answers
    2. Sarah asked by Sarah
    3. views icon 2,068 views
  5. 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 337 views
  6. 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
  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. 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
  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 1,072 views
  10. 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 1,893 views