Mathematics, 21.01.2020 01:31 loveoneonly4379

If a+b+c=180 prove that cos^2a + cos^2b + cos^2c = 1 - 2cosacosbcosc

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If a+b+c=180 prove that cos^2a + cos^2b + cos^2c = 1 - 2cosacosbcosc...

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