Suggested: a/sina=b/sinb=c/sinc=2r - sina/cosb.cosa+sinb/cosc.cosa+sinc/cosa.cosb=2 tana.tanb.tanc - 2 sina sinb - (cosa+cosb)^2+(sina+sinb)^2=4cos^2(a-b/2) - (cosa-cosb)^2+(sina-sinb)^2=4sin^2(a-b/2) - sina+sinb+sinc=4cosa/2 cosb/2 cosc/2 - cosa/sinb sinc+cosb/sinc sina+cosc/sinasinb=2 - sina+sinb-sinc=4sina/2 sinb/2 cosc/2 - sina/2+sinb/2+sinc/2 - sina/2+sinb/2-sinc/2=-1+4 cos - sina-sinb+sinc=4sina/2 cosb/2 sinc/2 - sina+sinb=2 then cosa+cosb= - if a+b+c=180 then sina/2+sinb/2+sinc/2 - if 1/sina+1/cosa=1/sinb+1/cosb prove that cot(a/2+b/2)=tanatanb - 2 sina sinb Browse related:
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