(来学网)设向量函数A(t)={2cost,sint,t},则导数向量为( )。
  • A.
    (来学网){-2sint,cost,1}
  • B.
    (来学网){2sint,cost,1}
  • C.
    (来学网){-2sint,sint,1}
  • D.
    (来学网){-2cost,sint,1}