Show that Sin2A - tanA = (tanA).(cos2A) ?? I have so far worked it to : Sin2A - tanA = - sinA/cosA + (2SinA).(cosA) Really stuck now any help would be appreciated guys.
Last edited by mr fantastic; Jun 21st 2010 at 03:07 PM. Reason: Re-titled.
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Many thanks,appreciated.
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