Prove cos2x-cos2y/cos2x+cos2y=tan(x+y)tan(y-x)

Prove cos2x-cos2y/cos2x+cos2y=tan(x+y)tan(y-x)
1. 0 answers
2. asked by Anonymous
3. 602 views
A=cos2x+isin2x ,B=cos2y+sin2y hence prove that A-B/A+B=itan(x+y).
1. 0 answers
2. asked by Saloni
3. 627 views
If a=cos2x+isin2x ,b=cos2y +isin2y prove thAt a+b=2Cos(x-y)(cos(x+y)+isin(x+y))
1. 1 answer
2. asked by moyeon
3. 911 views
if a=cos2x + sin2x and b=cos2y + isin2y.then find (a + b)
1. 1 answer
2. asked by Himanshu
3. 636 views
Prove:sin2x / 1 - cos2x = cotx My Attempt: LS: = 2sinxcosx / - 1 - (1 - 2sin^2x) = 2sinxcosx / - 1 + 2sin^2x = cosx / sinx - 1 =
1. 5 answers
2. asked by Anonymous
3. 1,438 views
Solve the equation of the interval (0, 2pi)cosx=sinx I squared both sides to get :cos²x=sin²x Then using tri indentites I came
1. 4 answers
2. asked by Brian
3. 796 views
Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)
1. 2 answers
2. asked by Joel
3. 1,169 views
Where do I start to prove this identity:sinx/cosx= 1-cos2x/sin2x please help!! Hint: Fractions are evil. Get rid of them. Well,
1. 0 answers
2. asked by maria
3. 823 views
Solve identity,(1-sin2x)/cos2x = cos2x/(1+sin2x) I tried starting from the right side, RS: =(cos²x-sin²x)/(1+2sinxcosx)
1. 3 answers
2. asked by sh
3. 748 views
prove sin2x+cos2x+1 tan(pi/4+x)______________ = __________ sin2x+cos2x-1 tanx so what I did tan(x)
1. 2 answers
2. asked by Lana
3. 749 views