求Wc,麻烦写详细点
Wc写的麻烦,用x代替
tan(arctg0.1x+arctgx)=tan30
[tan(arctg0.1x)+tan(arctgx)]/[1-tan(arctg0.1x)tan(arctgx)]=(0.1x+x)/(1-0.1x ^2)=1/√ 3
(1.1√ 3)x=1-0.1x^2
x=0.51 或者 -19.56(舍去)