tan a/2=
![\sqrt{1 - cos \: a} \div \sqrt{1 + cos \: a} \sqrt{1 - cos \: a} \div \sqrt{1 + cos \: a}](https://tex.z-dn.net/?f=+%5Csqrt%7B1+-+cos+%5C%3A+a%7D+%5Cdiv++%5Csqrt%7B1+%2B+cos+%5C%3A+a%7D+)
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JaiHind ♡
MathsOutOfMind!!!
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