已知sin(x+派/3)+sinx=-4根号3/5 且 - 派/2
问题描述:
已知sin(x+派/3)+sinx=-4根号3/5 且 - 派/2
答
1/2sinx+√3/2 cosx+sinx=-4√3/5
3/2sinx+√3/2 cosx=-4√3/5
√3/2sinx+1/2 cosx=-4/5
sin(x+π/6)=-4/5
∵-π/3