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Prove that: cos 4θ−cos 4α=8(cos θ−cos α)(cos θ+cos α)(cos θ−sin α)(cos θ−sin α) |
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Answer» Prove that: cos 4θ−cos 4α=8(cos θ−cos α)(cos θ+cos α)(cos θ−sin α)(cos θ−sin α) |
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