Question

sin(A-B)/cosAcosB + sin(B-C)/cosBcosC + sin(C-A)/cosCcosA =0​

Answer 1

$\huge \pink \dag \sf \color{cyan}A \color{pink}N \color{orange}S \color{blue}W \color{green}E \color{gray}R \color{purple} \leadsto$

see attached picture