State whether the following derivatives of vector-valued functions r 1 (t) and r 2 (t) are scalars
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State whether the following derivatives of vector-valued functions r1(t) and r2(t) are scalars or vectors:
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d (a) -r(t) dt (b) dt (r(t) r(t)) - (c) (r(t) x r(t)) dt
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