cos+2+xy+的导数

贲鸿真1692cos(xy)=x求隐函数的导数dy/dx -
茅玲威17317251883 ______[答案] cos(xy)=x 两边对x求导:-sin(xy)[y+xy']=1 y+xy'=-1/sin(xy) xy'=-y-(1/sin(xy)) y'=[-y-(1/sin(xy))]/x

贲鸿真1692sin(xy^2)的导数 -
茅玲威17317251883 ______[答案] 【sin(xy²)】' =cos(xy²)(y²+x2xyy') =(y²+2xyy')cos(xy²) 这里不仅要注意复合函数求导,而且还要注意y是关于x的函数.

贲鸿真1692matlab 有一函数 f(x,y)=x2+cos(xy)+2y ,写一程序,输入自变量的值,输出函数值. -
茅玲威17317251883 ______ function f=fun4(x,y) f=x^2+cos(x*y)+2*y ;

贲鸿真1692求导数,y=cos^2根号xy=ln sin2x -
茅玲威17317251883 ______[答案] (1)y=cos^2√xy'=2cos√x*(cos√x)' =2cos√x*(-sin√x)*(√x)' =2cos√x*(-sin√x)*(1/2)*1/√x =-sin(2√x)(1/2)*1/√x =-sin(2√x)/(2√x)(2)y=ln sin2xy'=1/(sin2x)*(sin2x)' =1/(sin2x)*(cos2x)*(2x)' =1/...

贲鸿真1692求导.cos(x+a)的导数?(2在cos的右上角,就是平方的意思)如果是cos(x+a)的导数呢 -
茅玲威17317251883 ______[答案] cos(x+a)的导数 =2cos(x+a)*(-sin(x+a)) =-sin(2x+2a) cos(x+a)的导数 =-3cos(x+a)*sin(x+a)

贲鸿真1692求z=sin(xy)+cos^2(xy)的y的偏导 -
茅玲威17317251883 ______[答案] Zy=ycos(xy)+2cos(xy)*[-sin(xy)]*x =ycos(xy)-xsin(2xy)

贲鸿真1692函数y=sin3(3x+ π 4)的导数是( ) -
茅玲威17317251883 ______[选项] A. 3sin2(3x+ π 4)cos(3x+ π 4) B. 9sin2(3x+ π 4)cos(3x+ π 4) C. 9sin2(3x+ π 4) D. −9sin2(3x+ π 4)cos(3x+ π 4)

贲鸿真1692Xy - sin(x+y)=1 求Y的导数 -
茅玲威17317251883 ______[答案] 对x求导(xy)'=x'*y+x*y'=y+x*y'[sin(x+y)]'=cos(x+y)*(x+y)'=(1+y')cos(x+y)=cos(x+y)+cos(x+y)*y'1'=0所以y+x*y'-cos(x+y)-cos(x+y)*y'=0y'=[y-cos(x+y)]/[cos(x+y)-x]

贲鸿真1692求导数y=e^x*sin2x y=4(x+1)^2+(3x+1)^2求导数y=e^xsin2xy=4(x+1)^2+(3x+1)^2能用复合函数做么?怎么求导数. -
茅玲威17317251883 ______[答案] y=e^xsin2x y'=e^xsin2x+e^x*cos2x*(2x)' =e^xsin2x+2e^x*cos2x y=4(x+1)^2+(3x+1)^2 y'=8(x+1)+2(3x+1)*(3x+1)' =8(x+1)+6(3x+1) =8x+8+18x+6 =26x+14

贲鸿真1692求x^2+xy+y^2=4的导数=2x+y+x*y'+2y*y'=0,不是先对x求导再对y求导吗?按理来说答案应该是=2x+yy'+2yy'=0我的算法错在哪啊~还是我对隐函数求导理解错误... -
茅玲威17317251883 ______[答案] 1.x^2+xy+y^2=4,两边对x求导时,你要把y看成是X的函数,这样,xy的导数是两个函数乘积的导数 所以,求导得:2x+y+x*y'+2y*y'=0,解出y'即可 2. y=(x-2)^(5/3),y'=5/3(x-2)2/3,y''=5/3*2/3(x-2)^(-1/3). 所以当x=2时,y'=0,y＂不存在 (x-2)在分母了