xy+cosy-sinx=1,求dy.
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xy+cosy-sinx=1,求dy.
xy+cosy-sinx=1,求dy.
xy+cosy-sinx=1,求dy.
两边微分:d(xy)+dcosy-dsinx=0
ydx+xdy-sinydy-cosxdx=0
dy=(cosx-y)dx/(x-siny)
xy+cosy-sinx=1,求dy.
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(cosy+ycosx)dx+(sinx-siny)dy=0
满足cosx*cosy-sinx*siny=1/2的角xy有可能哪些
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