Question: In Exercises 1 5 - 2 0 , let 1 ( t ) = e ' i ( s i n t ) j t

In Exercises 15-20, let 1(t)=e'i(sint)jt3k and 2(t)=e-ti(csct)j-2t3k. Find each of the stated derivatives in two different ways:
15.ddt[1(t)2(t)]
In Exercises 1 5 - 2 0 , let 1 ( t ) = e ' i ( s

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