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; June 21st 2010 at 02:07 PM.
Follow Math Help Forum on Facebook and Google+
View Tag Cloud