" I8."(sin x-sin y)/(cos x+cos y)=tan(x-y)/(2)

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

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

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

prove that (sin x-sin y)/(cos x+cos y) = tan "" ( x-y)/(2)

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

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

Prove the following: (i) ("sin" x+"sin" y)/(cos x+cos y)="tan""(x+y)/(2) (ii) (cos 7x+cos 5x)/("sin" 7x-"sin" 5x)=cot x .

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

Show that ( sin x + sin y) /( cos x + cos y) = tan ""(x+y)/(2)

(sin 2x - sin 2y)/(cos 2y-cos 2x) = cot (x+y)