They changed the sine to cosine!

A challenging trigonometric problem: if cos(3x)/cos(x)=1/3, then what is the value for sin(3x)/sin(x)? Learn how to solve this hard math problem by using the triple angle formula for sin(3x) and the proof of sin(3x) is here    • sin(3x) in terms of sin(x)   ---------------------------------------- 🛍 Shop my math t-shirt & hoodies: amzn.to/3qBeuw6 💪 Get my math notes by becoming a patron:   / blackpenredpen   #blackpenredpen #math #trigonometry #tutorial