Mathematics, 28.09.2019 15:10 joeykyle05
Prove tan(θ / 2) = sin θ / (1 + cos θ) for θ in quadrant 1 .
Answers: 1
![\frac{sin\Theta}{1+cos\Theta}=\frac{2sin(\frac{\Theta }{2})cos(\frac{\Theta }{2})}{1+[2cos^{2}(\frac{\Theta }{2})-1]}](/tpl/images/0271/2916/1c77c.png)
[ Tan θ will be positive since θ lies in 1st quadrant ]
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Prove tan(θ / 2) = sin θ / (1 + cos θ) for θ in quadrant 1 ....
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