cos(x-y)=3cos(x-y)then cotxcoty=
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Step-by-step explanation:
cos(x-y)=3cos(x+y)
cosxcosy+sinxsiny=3(cosxcosy-sinxsiny)
cosxcosy+sinxsiny=3cosxcosy-3sinxsiny
4sinxsiny=2cosxcosy
4/2=cosxcosy/sinxsiny
2=cotxcoty
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