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Prove that cos 60° = 2 cos2 30° – 1 |
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Answer» RHS = 2 cos2 30° – 1 = 2(√3/2)2 - 1 = 2 x 3/4 - 1 = 3/2 - 1 = 1/2 L.H.S. = cos 60° = 1/2 ∴ L.H.S. = R.H.S. |
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