MathDB
sin x <= sin (x+1)<=. ..<= sin (x+4) (I Soros Olympiad 1994-99 Round 2 11.2)

Source:

May 26, 2024
algebrainequalitiestrigonometry

Problem Statement

Find the smallest positive xx for which holds the inequality sinxsin(x+1)sin(x+2)sin(x+3)sin(x+4).\sin x \le \sin (x+1)\le \sin (x+2)\le sin (x+3)\le \sin (x+4) .