" 5."(cos2x)/(cos x-sin x)=cos x+sin x

2tan2x = (cos x + sin x) / (cos x-sin x) - (cos x-sin x) / (cos x + sin x)

Prove that (cos x + sin x)/(cos x - sin x) - (cos x - sin x)/(cos x + sin x) = 2 tan x

int cos2x*log((cos x+sin x)/(cos x-sin x))dx

int cos2x*log((cos x+sin x)/(cos x-sin x))backslash dx

Prove that: (i) (1+"sin" 2theta-cos 2theta)/(1+"sin" 2theta+cos 2theta)="tan" theta . (ii) 2 tan 2x=(cos x+"sin" x)/(cos x-"sin" x)-(cos x-"sin" x)/(cos x+"sin" x) .

(1 + sin 2x + cos 2x )/( cos x + sin x ) = 2 cos x

Prove that : (cos 9x - cos 5x)/(sin 17x -sin 3x)=- (sin 2x)/(cos 10x) .

(cos 9x - cos 5x)/(sin 17x - sin 3x) = (-sin 2x)/(cos 10x)

Prove that : (cos 9x - cos 5x)/(sin 17x - sin 3x) = (-sin 2x)/(cos 10x)

if a=(1+sin x)/(1-cos x+sin x) then (1+cos x+sin x)/(2sin x) is