思考辨析 判断下列说法是否正确,正确的在后面的括号内打“√”,错误的打“×”. (1)若f(x)=a2+2ax+x2,则f'(a)=2a+2x.( ) (2)运用法则求导时,不用考虑f'(x),g'(x)是否存在.( ) (3)[x2f(x)]'=2xf'(x).( ) 答案:(1)× (2)√ (3)× (4)×