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

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