" If "f(x)=(2018x-2019)/(x+i)" and "f(f(x))=x," then "lambda" is equal to "

If f(x)=(2018x-2019)/(x+lambda) and f(f(x))=x then lambda=

If f(x)=x+3, then f(x)+f(-x) is equal to

If f(x)=|x-1|" and "g(x)=f(f(f(x))) , then for xgt2,g'(x) is equal to

If f(x)=|x-1|" and "g(x)=f(f(f(x))) , then for xgt2,g'(x) is equal to

If f'(x)=sqrt(x) and f(1)=2 then f(x) is equal to

If f'(x)=sqrt(x) and f(1)=2 then f(x) is equal to

Suppose |(f'(x),f(x)),(f''(x),f'(x))|=0 where f(x) is continuous differentiable function with f'(x) !=0 and satisfies f(0)=1 and f'(0)=2 , then f(x)=e^(lambda x)+k , then lambda+k is equal to ..........