Pls also tell how to solve the next question after 3...
See its olympaid type problem u have asked that before (imo 2001) problem type u asked for 4 degree same problem
hint - mod inequality
Question is wrong Take f(x)=1-2(x-1)^2.
May be he mean |f(x)|\leq 1.
@Jagdish_Singh sir its f'(x) only
actually in question it is given f(|x|)\leq 1.
It may be mistake u told that in above post i thought little bit diffrent sorry sir
After that what is ur approach if its |f(x)| \le 1
Same as above....
@Sneha_2021 could you pls explain the last step?
Mod equality used