find the derivative of following expression
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cos( xy) (y + X.Y') -sin(xy)(y + x.y')=0
cos( xy) = sin xy
2 cos xy = 1
xy = pie/3
y' + y= pie/3
y'= pie/3 - y
cos( xy) = sin xy
2 cos xy = 1
xy = pie/3
y' + y= pie/3
y'= pie/3 - y
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