題組內容
1. (20% )
(a) On the curve xey+sin(xy)+ y - ln2=0 , viewing y as a differentiable function of x, find 
and the tangent line at (0, ln 2).
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(a) On the curve xey+sin(xy)+ y - ln2=0 , viewing y as a differentiable function of x, find and the tangent line at (0, ln 2).