1. Let f: ZZ be defined by f(x) = -x for all x € Z. Is f injective?

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A: Answer and explanation is given below..

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A: unit vector cross product:i^ x j^ = k^                           j^ x i^ = -k^j^ x k^ = i^…

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A: Simplification

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A: Answer is in next step

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Q: 11. The diagonal of a square is 2 times the length of one side. True False

A: We consider the square and check for the given condition

Q: 1. V6x = -3 3. бх

A: