Mathematics, 23.03.2021 04:40, djdjdoododdo837

1 1
1 + cos 0 +cos

1 - cos 0
2cosec2 0

$\frac{1}{1 + cos } + \frac{1}{1 - \cos} = 2 \cosec {2}$

Answers: 1

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1 1
1 + cos 0 +cos

1 - cos 0
2cosec2 0...