sin(β) = sin(β-π/6+π/6)=sin(β-π/6)cos(π/6) + cos(β-π/6)sin(π/6)
= 3/5*√3/2 + 4/5 * 1/2 = 3√3/10 + 2/5
如果还有不懂的,可以点击用户名到我网站来提问,我会尽力为你回答的
sin(β) = sin(β-π/6+π/6)=sin(β-π/6)cos(π/6) + cos(β-π/6)sin(π/6)
= 3/5*√3/2 + 4/5 * 1/2 = 3√3/10 + 2/5
如果还有不懂的,可以点击用户名到我网站来提问,我会尽力为你回答的