lc=2abcosy/2/a+b выразите cosy/2
lc=2abcosy/2/a+b <=> 2abcosy/2/a=lc-b <=> cosy/2/a=(lc-b)/(2ab) <=> cosy/2=a*(lc-b)/(2ab)
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lc=2abcosy/2/a+b <=> 2abcosy/2/a=lc-b <=> cosy/2/a=(lc-b)/(2ab) <=> cosy/2=a*(lc-b)/(2ab)