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Suggested: if a+b+c=π prove that cos2a+cos2b+cos2c=1-2cosacosbcosc - if a+b+c=180 then cos2a+cos2b+cos2c= - if a+b+c=π/2 prove that cos2a+cos2b+cos2c=1+4sinasinbsinc - if a+b+c=%CF%80 prove that cos2a+cos2b+cos2c=1 2cosacosbcosc Browse related:
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