How to show 2arctan(1/2)=arctan(4/3)

Trigonometric ratios and functions, the unit circle, inverse trig functions, identities, trig graphs, etc.
jinxt
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How to show 2arctan(1/2)=arctan(4/3)

Postby jinxt » Wed Apr 22, 2009 12:39 am

I've searched my whole trig book, looked through all my notes but still, I can't seem to figure this problem out! Can anyone give me some help? It would greatly be appreciated!

Show that: 2arctan(1/2)=arctan(4/3)

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Martingale
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Re: How to show 2arctan(1/2)=arctan(4/3)

Postby Martingale » Wed Apr 22, 2009 1:41 am

jinxt wrote:I've searched my whole trig book, looked through all my notes but still, I can't seem to figure this problem out! Can anyone give me some help? It would greatly be appreciated!

Show that: 2arctan(1/2)=arctan(4/3)


if you apply the tangent to both sides and use the formula...



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