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1-2sin(power of 2)4x as cos ax?

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1-2sin(power of 2)4x as cos ax?

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  1. you dont even need to solve it,,use formula

    cos Ax = 1 - 2 sin² (A/2)x

    or

    cos 2x = 1 - 2 sin ²x

    so answer would be

    cos8x

    so A=8


  2. Unsolvable even for my large brain

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