a=(sin(q+∏/),1),b=(4,4coosq-√3),若|a+b=|a-b|,则sin(q+4∏/3)=

a=(sin(q+∏/),1),b=(4,4coosq-√3),若|a+b=|a-b|,则sin(q+4∏/3)=
a=(sin(q+∏/),1),b=(4,4coosq-√3),若|a+b=|a-b|,则sin(q+4∏/3)=

a=(sin(q+∏/),1),b=(4,4coosq-√3),若|a+b=|a-b|,则sin(q+4∏/3)=
sin(a+b)=3/4 sinacosb+cosbsina=3/4 (1) sin(a-b)=-1/4, sinacosb-cosbsina=-1/4 (2) (1)+(2) 2sinacosb=1/2 sinacosb=1/4