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![]() | If A, B, C are angles in a triangle, then cos 2A + cos 2B + cos 2C = -1 – 4 cos A cos B cos C (vikram angala) View |
![]() | Proof of Cos 2A + Cos 2B + Cos 2C = -1 - 4 Cos A Cos B Cos C. (Our Math Channel) View |
![]() | cos 2A + cos 2B + cos 2C = 1 - 4 cos A cos B cos C (Lilinka) View |
![]() | Proof of Cos 2A - Cos 2B + Cos 2C = 1 - 4 Sin A Cos B Sin C (Our Math Channel) View |
![]() | If `A+B+C=pi `, prove that `cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.` (Doubtnut) View |
![]() | Prove that : cos2A - cos2B + cos2C = 1 - 4sinA cosB sinC (Pace Edu.) View |
![]() | TRIGONOMETRY- cos 2A - cos 2B + cos 2C = 1-4 sin A cos B sin C (E-SHTAM) View |
![]() | In a `triangleABC` prove that `cos2A+cos2B+cos 2C=-1-4cosAcosBcosC` (Doubtnut) View |
![]() | Trigonometry Class 11 | Cos2A + Cos2B + Cos2C = -4 CosA CosB CosC -1 (Mathematics By Akash) View |
![]() | If `A+B+C=pi,`prove that `cos 2A-cos 2B-cos 2C=-1+4cos A sinBsinC` (Doubtnut) View |