sahiljumnani9 sahiljumnani9

13-02-2017
Mathematics

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

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strawberry99 strawberry99

14-02-2017

cos2A+cos2C+2cosacosbcosc=1−cos2B

os2A+2cosacosbcosc=1−cos2B−cos2C

cos2A=1−cos2B−cos2C−2cosacosbcoscosA=±√1−cos2B−cos2C−2cosacosbcosc

A=arccos(√1−cos2B−cos2C−2cos(a)cos(b)cos(c)),arccos(−√1−cos2B−cos2C−2cos(a)cos(b)cos(c)

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