$f(x)={\cos }^{2}3x$，则$f'(3x)=$$\left(\,\,\,\,\,\right)$
$A、$$-3\sin (6x)$
$B、$$-3\sin (18x)$
$C、$$-9\sin (18x)$
$D、$$-9\sin (6x)$
y=(sin )^2(2-3x)，则dy=(,,,,,)A、sin (4-6x)dxB、(cos )^2(2-3x)dxC、-3sin (4-6x)dxD、-3
求 lim _(xarrow 0)dfrac ({e)^(x^3)-1-(x)^3}({sin )^6x}= = ()
函数f（x）=x-2sin(x)/(2)cos(x)/(2)，则f（0）=（ ）A. 0B. 1C. -1D. $\sqrt{2}$
若函数=sin 3x，则=sin 3x_____.若函数，则_____.
函数f（x）=x-2sin(x)/(2)cos(x)/(2)，则f′（(π)/(3)）=（ ）A. 0B. $\frac{1}{2}$C. $\frac{\sq
若int f(x)dx=sin x+C,则f(x)=_____若$\int f(x)dx=\sin x+C$,则f'(x)=_____
int (sin )^3x(cos )^5xdx= __ A.int (sin )^3x(cos )^5xdx= __ B.int (sin )
(x)=sin x,则(x)=sin x,______A 2 B 1 C (x)=sin x,D (x)=sin x,则______A2B1CD
20.求不定积分 int ((2)^x+3cos x)dx ()()-|||-A dfrac ({2)^x}(ln 2)-3sin x+C-|||-B ^xln
int dfrac (sin x)({cos )^3x}dx=______.______.