In Exercises prove the property. In each case, assume r, u, and v are differentiable vector-valued functions
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In Exercises prove the property. In each case, assume r, u, and v are differentiable vector-valued functions of t in space, w is a differentiable real-valued function of t, and c is a scalar.
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d [w(t)r(t)] = w(t)r'(t) + w'(t)r(t) dt
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