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  3. if cos ? = sin ?, which of the following could be

If cos ? = sin ?, which of the following could be true of ?...

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Calculus

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If cos ? = sin ?, which of the following could be true of ? and ??I. ? + ? = 90II. ? and ? lie in different quadrantsIII. ? = ?(A) I only(B) II only(C) III only(D) I and III only(E) I, II, and III

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