Which expression is equivalent to tan(x)+tan(y)1−tan(x)tan(y)\frac{\tan(x) + \tan(y)}{1 - \tan(x)\tan(y)}1−tan(x)tan(y)tan(x)+tan(y)?
tan(x+y)\tan(x+y)tan(x+y)
tan(x−y)\tan(x-y)tan(x−y)
sin(x+y)\sin(x+y)sin(x+y)
cos(x+y)\cos(x+y)cos(x+y)