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Suggested: cos2a+cos2b+cos2c=-1-4 cosa cosb cosc - cos2a+cos2b+cos2c=1-2cosacosbcosc - cos2a+cos2b+cos2c - cos2a+cos2b+cos2c=-4cosacosbcosc-1 - cos2a+cos2b+cos2c=1+4 sin a sin sinc - cos2a+cos2b-cos2c=1-4 sin a sin b cos c - cos2a-cos2b+cos 2 c=1-4 sin a cosb sinc - cos2a-cos2b-cos2c=-1+4 cosa sinb sinc - cos2a+cos2b-cos 2 c=1-2sinasinb cosc - show that cos2a/2+cos2b/2+cos2c/2=2+r/2 r - cos2a+cos2b+cos2c Browse related:
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