3 quick question's on Identities
1)How would you verify this numerically?
there is no given value of x so Im confused just use a calculator?
2)even when you get a given value of x I get confused like
3)also if you are given a list of possible identities and are asked to say which ones are and which ones arent how do you do that? Just sketch it, I mean it worked for me but if you have a easier way Id love any input.