In Exercises 61–68, 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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(1)n × (1),.¹ + (1),n × (1).¹ = [(1)n × (1)-¹]. 01/7/2