F2 數學 11.8B: 三角恆等式：sin²X+cos²X=1

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    t9505

    By: t9505

    Date Uploaded: 05/18/2017

    Tags: M2_11_Trigon_9IdentityB_sin²X+cos²X=1  

    M2_11_Trigon_9IdentityB_sin²X+cos²X=1

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