求y=3x cosy满足x=1,y=0的特解
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(e^xsiny-3y)对y求导得:e^xcosy-3(e^xcosy+x)对x求到得:e^xcosy+1考虑L1:(0,2)到(0.0)的直线段,则L和L1构成封闭曲线,逆时针方向,所围区域为D由格
∫L(e^xsiny-3y)dx+(e^xcosy+x)dy=∫L(-4y)dx=0
补上直线N:y=0、使得半圆y=√[1-(x-1)²]与直线N围成闭区域.P=e^xsiny-my、Q=e^xcosy-m∂P/∂y=e^xcosy-m、∂
3f(x)+f(-1/x)=2x-x(1)令x=-1/x则3f(-1/x)+f(x)=2/x+1/x(2)(1)×3-(2)8f(x)=6x-3x-2/x+1/x所以f(x)
等式两边对x求偏导,cosy+z'(x)*(-sinxy)*y=0,z'(x)=cosy/y*sinxyz''(xy)=-(cosy/y)*(1/(sinxy)^2)*cosxy*y原式两边对y求偏导
x=4,y=0.5,x+y=4.5(与人家的做法一样……)(1)解题思路是以S3为基准,用S3表示出S1,S2,S4即可.在三角形BCD中有:S2/S3=DF/CF,故S2=(DF/CF)S3;同理,
参考答案:停车坐爱枫林晚,霜叶红于二月花.
(sinydx+xcosydy)+(y^2sinxdx-2ycosx)dy=0[sinydx+xd(siny)]+[y^2d(-cosx)-cosx(dy^2)]=0d(xsiny)+d(-y^2co
1/2|x-y|+|y-1/2|=0x-y=0y-1/2=0解得:x=y=1/23x+7y=10x=5
用隐函数求导法则:注意y是关于x的函数,方程两边对x求导有(x)'cosy+x(cosy)'+(y)'lnx+y(lnx)'=0即cosy-x(siny)y'+y'lnx+y(1/x)=0,根据上述方
dy/dx=1/(xcosy+sin2y)=1/(xcosy+2sinycosy)所以cosydy/dx=1/(x+2siny)所以dsiny/dx=1/(x+2siny)所以dx/dsiny=x+2
答案是y'+cosy-xsiny*y'=2x
①偏z/偏x=偏z/偏u偏u/偏x+偏z/偏v偏v/偏x=(2uv-v^2)siny+(2uv-v^2)cosy=(2x^2sinycosy-x^2(cosy)^2)siny+(2x^2sinycos
补上线段y=0则令P=e^xsiny-y,dP/dy=e^xcosy-1Q=e^xcosy-1,dQ/dx=e^xcosy∫_L(e^xsiny-y)dx+(e^xcosy-1)dy=∫∫_D[(e^
dx/dy=xcosy+sin2yx'-cosyx=sin2yx的一阶微分方程注意是x=x(y)两边同乘e^(-siny)[e^(-siny)*x]'=sin2y*e^(-siny)e^(-siny)
两边对X求导得:cosy-x(siny)y'=cos(x+y)(1+y')化得:y'=[cosy-cos(x+y)]/[cos(x+y)+xsiny]再问:没搞懂啊!确信这个对吗?我都好久不学这个了,
dy/dx=(ycos(y/x)-x)/(xcos(y/x))=y/x-sec(y/x)设u=y/x,y=ux,dy/dx=u+u'x即u'x=-secucosudu=-dxsinu=-x+C即通解为
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