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math

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verify identity:

tanx=cscx-cotx

  • math - ,

    RS = 1/sinx - cosx/sinx
    = (1- cosx)/sinx
    ≠ tanx

    this is not an identity,
    let x = 45°
    tan45 = 1
    csc45 - cot45 = √2 - 1 ≠ 1

    all we needde was one counterexample to show it to be false.

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