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Does anyone know how to calculate the formula for acos in relation to cos?

We know that cos (∏/3) = 0.5

and acos(0.5) = ∏/3

However, I assumed I could calculate acos(x) in relation to cos(x) as: 1/cos(x).

Well, I assumed wrong :(

Is there any way to do this?

Thanks

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# How to define acos in relation to cos?

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