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Suggested: sina+sinb+sinc=4cosa/2 cosb/2 cosc/2 - sina+sinb+sinc=s/r - sina+sinb+sinc - sina+sinb+sinc=4sina/2 sinb/2 cosc/2 - sina-sinb+sinc=4sina/2 cosb/2 sinc/2 - sin2a+sin2b+sin2c/sina+sinb+sinc - cosa/sinb sinc+cosb/sinc sina+cosc/sinasinb=2 - sina/2+sinb/2+sinc/2 - sina/2+sinb/2-sinc/2=-1+4 cos - if a+b+c=180 then sina/2+sinb/2+sinc/2 - a/sina=b/sinb=c/sinc - a/sina=b/sinb=c/sinc=2r - prove that a/sina=b/sinb=c/sinc - sina cosb cosa+sinb cosc cosa+sinc cosacosb - sina+sinb+sinc Browse related:
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