1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
问题描述:
1.根号3cosa+sina 2.-sina+根号3cosa 3.cosa-根号sina
答
1.根号3cosa+sina=2(根号3/2*cosa+1/2*sina)=2sin(a+兀/3)
2.-sina+根号3cosa =2(根号3/2*cosa-1/2*sina)=2sin(兀/3-a)
3.cosa-根号sina 少数没?不晓得了
答
1.√3cosa+sina =2(√3/2•cosa+1/2•sina)=2[sin(π/3)•cosa+cos(π/3)•sina]=2sin(π/3+a)或:√3cosa+sina =2(√3/2•cosa+1/2•sina)=2[cos(π/6)•cosa+sin(π/6)•...