为什么sina+sinb==2sin(a+b)\/2*cos(a-b)\/2
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为什么sina+sinb==2sin(a+b)\/2*cos(a-b)\/2
为什么sina+sinb==2sin(a+b)\/2*cos(a-b)\/2
为什么sina+sinb==2sin(a+b)\/2*cos(a-b)\/2
ina+sinb==2sin(a+b)\