1)
AC=BC*sinx/sinA=4sinx
AB=BC*sin(120°-x)/sinA=4sin(120°-x)
y=2√3+4[sinx+sin(120°-x)]
= 2√3+4√3[√3/2*sinx+1/2*cosx]
=2√3+4√3sin(30°+x),
解析式:y=2√3+4√3sin(30°+x),
定义域:0
1)
AC=BC*sinx/sinA=4sinx
AB=BC*sin(120°-x)/sinA=4sin(120°-x)
y=2√3+4[sinx+sin(120°-x)]
= 2√3+4√3[√3/2*sinx+1/2*cosx]
=2√3+4√3sin(30°+x),
解析式:y=2√3+4√3sin(30°+x),
定义域:0