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A) Find the angle between the vectors 8i-j + 4k and 4j + 2k B) Find...

A) Find the angle between the vectors 8i-j + 4k and 4j + 2k

B) Find c so that the vectors 2i-3j + ck and 2i-j + 4k are perpendicular

C) Find the scalar projection and the vector projection of 2i + 4j-4 on 3i-3j + k
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