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14 October, 15:33

Sin^ (2) x-cos^ (2) x=2sin^ (2) x-1

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  1. 14 October, 15:46
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    Step-by-step explanation:

    sin^2 x+cos^2 x=1

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

    cos^2 x=1-sin^2 x

    substitute, you get

    1-sin^2 x-sin^2 x=1-2sin^2 x

    I just proved this.
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