A.(ax2-bx+c)′=a(x2)′+b(-x)′
B.(sinx-2x)′=(sinx)′-(2)′(x)′
C.(cosx5sinx)=(sinx)′cosx+(cosx)′5cosx
D.(
)′=
A.(ax2-bx+c)′=a(x2)′+b(-x)′
B.(sinx-2x)′=(sinx)′-(2)′(x)′
C.(cosx5sinx)=(sinx)′cosx+(cosx)′5cosx
D.(
)′=
解析:
由和与差的导数运算法则可得A正确.选A.答案:
A