If (2SinA-CosA)/(CosA+SinA)=1 Find CotA
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= 1
2SinA-CosA = CosA+SinA
2SinA-SinA = CosA+CosA
SinA = 2CosA
=
it could be solved like that but I'm not sure for d answer, hope that helps .
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