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Cosx cosx -sinx sinx =cos2x how

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Cosx cosx -sinx sinx =cos2x how
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Mohd Ahsan Raza Khan 8 years, 3 months ago

If we multiply cosxcosx =cos²x. Sinxsinx = sin²x now, we sub. Cos²x-sin²x = cos2x and it is a formula. If we take only in cos then, cos 2x = cos²x -1+cos²x = 2cos²x-1
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