(B.) y = (1)/(2)x^2e^2x + sin 2x. (C.) y = (x)/(2)(x + 4)e^3x. (D.) y = (x^2co
函数=((cos x))^2的导数为()A.=((cos x))^2B.=((cos x))^2函数的导数为()A.B.
函数[y = x - sin (x)/(2)cos (x)/(2)]，当x=0时导数( )A. ${1}\over{2} $B. ${2}\over{9}
(int )_(0)^12xcos ((x)^2+1)dx= ( )A.cos 2- cos 1B.cos 2+ cos 1C.sin 2- sin 1D.si
已知曲线积分(int )_(1)^1(1+dfrac ({cos )^2}({x)^2}cos dfrac (y)(x))dx+(sin dfrac (y)(x
设区域 :(x)^2+(y)^2leqslant 1, 计算 =(iint )_(D)[ sin (x)^2cos (y)^2+sin (x-y)dxdy]
则 [ g(x)] = __-|||-A.sinx B.cosx C. -sin x D. -cos x
[主观题]d(sin2x+cosx)=_________dx.
cos 2x(e)^-x+ sin 2x(e)^-xdx-|||-B.cos2xe^(-x)- sin 2x(e)^-xdx-|||-. cos 2x(e)^
34 设 y = cos(x^2) sin^2 (1)/(x), 则 y = _.34 (1995, - (1) 题, 3分) 设 $y = \cos(x^2