y=x+e^y和y=cos(xy)-x的微分,详解3Q
问题描述:
y=x+e^y和y=cos(xy)-x的微分,详解3Q
答
为隐函数微分1)y=x+e^ydy=dx+e^ydydy/dx=1/(1-e^y)2)y=cos(xy)-xdy=-sin(xy)(ydx+xdy)-dxdy=-[sin(xy)*y+1]dx-sin(xy)*xdy[1+xsin(xy)]dy=-[ysin(xy)+1]dxdy/dx=-[ysin(xy)+1]/[xsin(xy)+1]第二题和答案一样,第一题答案上写的是dy/dx=e^y/1-xe^y答案错了?你再看看抄错题没有,否则就是那习题答案错了。