A=cos2x+isin2x ,B=cos2y+sin2y hence prove that A-B/A+B=itan(x+y...

find dy/dx of xsiny+cos2y=cosy

sin2x+sin2y=2sin(x+y)cos(x-y) Please helpp mee!! thank you sooo much really!!

cos2x=cos(x+x)=

If y = (cos²x)/(1 + sin x), then dy/dx = ?

F(x)=cos2x and g(x) =-sin x. Sketch the graphs of f and g on the same set es (-90,90)...

prove the identity sin2x-sin2y/sin2x+sin2y=tan(x-y)/tan(x+y)

If a=cos2x+isin2x ,b=cos2y +isin2y prove thAt a+b=2Cos(x-y)(cos(x+y)+isin(x+y))

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

if a=cos2x + sin2x and b=cos2y + isin2y.then find (a + b)

Sin2x+sin2y=2sin(x+y)cos(x-y)

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