tan15=0.26794919243112270647255365849413
(tanx+tan15)/(1-tanxtan15)=2
tan(x+15)=2
x+15=63.434948822922010648427806279547
x=48.434948822922010648427806279547
≈48°26′5.82〃
tan15=0.26794919243112270647255365849413
(tanx+tan15)/(1-tanxtan15)=2
tan(x+15)=2
x+15=63.434948822922010648427806279547
x=48.434948822922010648427806279547
≈48°26′5.82〃