COSINE LAW
1 'COS
2 "S=0$dAø": ?$>G:
3 0$dG$}$G0:
4 û(N$2+O$2-2NO$cMø):
5 $G1:
6 $L0:
7 $c$1((N$2+O$2-M$2)ö2NO):
8 $L1

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