sinA+sinB
=2sin(A+B)/2cos(A-B)/2
=2sin(π-C)/2cos(A-B)/2
=2cosC/2cos(A-B)/2
=2cos30cos(A-B)/2
=√3cos(A-B)/2
A-B=0时,有最大值√3
(A-B)/2
sinA+sinB
=2sin(A+B)/2cos(A-B)/2
=2sin(π-C)/2cos(A-B)/2
=2cosC/2cos(A-B)/2
=2cos30cos(A-B)/2
=√3cos(A-B)/2
A-B=0时,有最大值√3
(A-B)/2