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# Quick trig question

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1. how does the above =
tan2x = 1
2. Divide both sides by and you obtain

edit: when division by isn't allowed, i.e. when , it is clear that and
3. (Original post by IShouldBeRevising_)

how does the above =
tan2x = 1
It doesn't.
4. (Original post by hassi94)
It doesn't.
tan 2x = -1 *
5. (Original post by IShouldBeRevising_)
tan 2x = -1 *
Divide both sides by cos2x.

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