Question

求个很简单的导函数,函数f(x)=X - 根号（X²+1）求f(x)的导函数,因为本人现在高一刚刚预习导函数,

Answer 1

f'(x)=x'-[√(x²+1)]'

=1-1/[2√(x²+1)]*(x²+1)'

=1-1/[2√(x²+1)]*2x

=1-x/√(x²+1)

=[√(x²+1)-x]/√(x²+1)