I have to show that the following identity holds when 1 + cos(2Ө) does not equal 0.
tan(Ө) = sin(2Ө)/1 + cos(2Ө)
I think to do this, you'd have to use cos2Ө and sin2Ө's formulas to derive a formula for tan(Ө) or tan(2Ө). It's the (2Ө) thing that throws me off.
Thanks. The third line is tricky.
I wanna get a forumula for tan(2Ө) in terms of tan(Ө) by using the cos(2Ө) = cos^2(Ө) - sin^2(Ө) and sin(2Ө) = 2sinӨcosӨ formulas.
Can I use tan(2Ө) = sin2Ө/cos2Ө and go on from there? And how would I get it back to tanӨ?