sinx+ siny/ (cosx+cosy)= tan 1/2

How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form of 1/2(sin2x + sin2y)?
1. 1 answer
2. asked by Anonymous
3. 651 views
2tan^-1(tanx/2×tan(π/4-y/2))=tan^-1(sinx×siny/cosx+cosy)
1. 1 answer
2. asked by Mansi
3. 546 views
sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y)prove this identity
1. 0 answers
2. asked by JK
3. 1,267 views
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. 3 answers
2. asked by marley
3. 1,605 views
cosx+cosy=a and sinx+siny=b show that sin2x+sin2y=2ab(1-(2/(a^2+b^2))plz plz show step
1. 7 answers
2. asked by maths
3. 1,893 views
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. 2 answers
2. asked by Anonymous
3. 1,353 views
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. 1 answer
2. asked by Anonymous
3. 1,676 views
Simplify #3:[cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [cosx-(sin90cosx-cos90sinx)sinx]/[cosx-(cos180cosx+sinx180sinx)tanx] =
1. 1 answer
2. asked by Anonymous
3. 1,072 views
Simplify:sin(x-y)cosy+cos(x-y)siny = (sinxcosy-cosxsiny)cosy+(cosxcosy+sinxsiny)siny = ??? What do I do next??? Please Help and
1. 4 answers
2. asked by Anonymous
3. 1,420 views
tanx+secx=2cosx(sinx/cosx)+ (1/cosx)=2cosx (sinx+1)/cosx =2cosx multiplying both sides by cosx sinx + 1 =2cos^2x sinx+1 =
1. 0 answers
2. asked by shan
3. 978 views