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Discrete Math Resources

Hi, can someone give me some hints about the second part(b) of this question? Thank you so much!   We consider buying three kinds of food. Food I has 1 unit of vitamin A, 3 units of vitamin...

Consider the surjective function cos: R → [−1, 1] and let ∼ be the associated equivalence relation x ∼ y ⇐⇒ cos x = cos y.   Describe the equivalence classes of ∼...

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