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1) cos 2x=cos2 x−sin2 x 2) 1+sin 2x=(cosx+sinx)2 3) 1−sin 2x=(cos x−sin x)2 How many of the above statements are correct? |
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Answer» 1) cos 2x=cos2 x−sin2 x 2) 1+sin 2x=(cosx+sinx)2 3) 1−sin 2x=(cos x−sin x)2 How many of the above statements are correct? |
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