If A+B+C=π,prove:cos2A+cos2B-cos2C=1-sinAsinBcosC| class 10

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If A+B+C = π , Prove that: cos2A + cos2B - cos2C = 1 - 4 sinA.sinB.cosC If A+B+C = π , Prove that: cos2A + cos2B - cos2C = 1 - 4 sinA.sinB.cosC
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If `A+B+C=pi `, prove that `cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.` If `A+B+C=pi `, prove that `cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.`
If A + B + C = pi/2 then prove that Cos 2A +Cos 2B + Cos 2C = 1+4 Sin A Sin B Sin C | 7 marks @EAG If A + B + C = pi/2 then prove that Cos 2A +Cos 2B + Cos 2C = 1+4 Sin A Sin B Sin C | 7 marks @EAG