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18 March, 10:25

Cos^2A + cos^2B + cos^2C + 2CosAcosBcosC = 1

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  1. 18 March, 13:37
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    cos 2 A + cos 2 C+2cosacosbcosc=1 - cos 2 B

    os 2 A+2cosacosbcosc=1 - cos 2 B - cos 2 C

    cos 2 A=1 - cos 2 B - cos 2 C-2cosacosbcosc osA=± √ 1 - cos 2 B - cos 2 C-2cosacosbcosc

    A=arccos (√ 1 - cos 2 B - cos 2 C-2cos (a) cos (b) cos (c) ), arccos ( - √ 1 - cos 2 B - cos 2 C-2cos (a) cos (b) cos (c)
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