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OpenStudy (anonymous):
Prove tan(θ / 2) = sin θ / (1 + cos θ) for θ in quadrant 1. I've looked at http://openstudy.com/study#/updates/4f78f650e4b0ddcbb89e7fe4 and http://openstudy.com/study#/updates/511ffe90e4b03d9dd0c5162b but I still can't figure it out!
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OpenStudy (anonymous):
|dw:1440229429187:dw| I can get to here but I don't know how to prove it from this point on.
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