Here is a video solution for ISI Entrance Number Theory Problems based on solving weird equations using Inequality. Watch and Learn!
Here goes the question…
Solve: 2 \cos ^{2}\left(x^{3}+x\right)=2^{x}+2^{-x}
We will recommend you to try the problem yourself.
Done?
Let’s see the proof in the video below:
I.S.I. & C.M.I. Entrance Program
Taught by students and alumni of I.S.I. & C.M.I.
