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I am having some trouble finding the

limit as x approaches pi/4 of (sinx-cosx)/(cos2x)

I can't really seem to get started on this one. I'm horribe at this sort of thing. Do you think it would be beneficial to break up the cos2x into one of its formulas or would it just be a waste of time? I've tried leaving it as cos2x and I've tried it with its identities but nothing is working for me. I can't get anything to simplify. Any help would be greatly appreciated as I have no idea where to go with this. Thanks.