(sin (2x) +sin(4x)/sin(2x)-sin(4x)) + (tan(3x))/tanx)
i'm totally lost o.o
2. You can PROVE an identity - i.e. show that two expressions are identically equal. Is that what you are trying to do? What are you trying to show that this is the same as? Or are you trying to ESTABLISH an identity? What was said above - there is not an equals sign so this is not an identity.