I believe that an identity are two different problems, related to trig, that in the end they will be equal to each other. The questions on either side of the equals sign may not look similar but are same sames, just different versions. Identities work for any value of any value. they will always work no matter what the inputs are.
DEF. an equality (trigonometric) that evaluates as true for any value of input, that is both sides of the trig. equations are true for ALL possible variables.
*note...trig equations that are not identities are conditional equations....*
trig identities are much like a logic sequence that we learned about many many years ago. ex, if a=b and b=c, then a must = c. it is a simple concept until you start applying it to trigonometric sequences. the harder part of this it trying to understand is that the sequence and everything in the question has a numerical value.
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