兩邊求全微分
sec^2(x+y)(dx+dy)=ydx+xdy
(sec^2(x+y)-x)dy=(y-sec^2(x+y))dx
所以,dy=[(y-sec^2(x+y)) / (sec^2(x+y)-x)]dx
tan(x+y)=xy 求dy
tan(x+y)=xy 求dy
數(shù)學(xué)人氣：210 ℃時間：2020-10-06 00:54:29
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