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20 April, 18:58

1+sin^2 x = 2-cos^2 x

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  1. 20 April, 19:34
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    1+sin²x=2-cos²x

    Remenber: sin²x+cos²x=1 ⇒sin²x=1-cos²x

    1+sin²x=1 + (1-cos²x) = 2-cos² x (this is true)
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