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Cos 4A - cos 4B = 8(cos A - cos B) (cos A +cos B) (cos A - sin B) (cos A + sin B)

Cos 4A - cos 4B = 8(cos A - cos B) (cos A +cos B) (cos A - sin B) (cos A + sin B)
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Cos 4A - cos 4B = 8(cos A - cos B) (cos A +cos B) (cos A - sin B) (cos A + sin B)

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User ChikabuZ
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Cos 4A - cos 4B = 8(cos A - cos B) (cos A +cos B) (cos A - sin B) (cos A + sin B)-example-1
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User Majie
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