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9 March, 12:51

What is cos^2x (sec^2x - 1)

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  1. 9 March, 13:29
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    cos²x. sec²x = 1 (formula)

    cos and sec are reciprocal to each other

    cos²x=1/sec²x

    now from the eq above, open the brackets and multiply

    1-cos²2x

    sin²2x
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