Japanese Math Olympiad Question

[@GREAT.P]

Wonderful performance

[@georgepaidas1132]

Allow me a clarification: Φ = fii, Θ = theta. That's a really nice equation.👏👏👏

[@jonathanr520]

how would you convert the final answer?

[@2106522]

x ~= 1.715620...

[@paulfrancis4956]

We use to put the signs +, =, ÷, - in the line with fraction sign 😮

[@tuanmanhtoan]

🎉🎉🎉 hay lắm. Phương trình hay

[@arni200377]

Excuse me. Why phi = W ( phi . e ^ phi ) ?

[@payoo_2674]

it can be phi, Φ, x or something else (black box) W(■*e^■) = ■ Lambert's W function is the inverse function of ■*e^■ If f(x) = x*e^x then f⁻¹(x) = W(x*e^x) = x

[@arni200377]

@@payoo_2674 Thank you. My ignorance about the Lambert Function, did I ask that...