1. If is a vector-valued function and let c be a constant. Show that if is differentiableon come interai I and if =0 for all t ∈ I be I then are orthognal for all t ∈ I .
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is a vector-valued function and let c be a constant. Show that if 
is differentiable
=0 for all t ∈ I be I then 
are orthognal for all t ∈ I .