Question

y＝cos³(2x+3)的导数是

1. A.
   y′＝3cos²(2x+3)
2. B.
   y′＝6cos²(2x+3)
3. C.
   y′＝-3cos²(2x+3)·sin(2x+3)
4. D.
   y′＝-6cos²(2x+3)·sin(2x+3)

Answer 1

D