i want to know the detail every step of young's equation derivation, which is written in a paper "Re-derivation of Youngs Equation, Wenzel Equation, and Cassie-Baxter Equation Based on Energy Minimization" (DOI: 10.5772/61066)

Can you answer with a detailed explanation on 2.1. Derivation of Youngs equation?

LV COS = SV - SL (LV : surface tension between the liquid and vapor phases, SV : surface tension between the solid and vapor phases, SL : surface tension between the solid and liquid phases)

Please don't skip any steps.

Thank you.