设y=f(x)由cos(xy)十Iny-x=1确定,则=().A.2 B.1

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问题 设y=f(x)由cos(xy)十Iny-x=1确定,则=().A.2B.1C.-1D.-2

选项 A.2
B.1
C.-1
D.-2

答案 A

解析
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