Prove the equation cos(x) = log_(2*pi)x has exactly 3 real solutions if x is measured in radians.

What must the base of the logarithm be reduced to to give the equation exactly two real solutions?

Somebody gave this puzzle a most unwarranted, and unfair rating of D1. I gave it a D5 to bring up the rating to D3.

Edited on September 6, 2022, 5:50 am

Posted by K Sengupta on 2022-09-06 05:45:06