r(t) = [tsint, et,t+Ï€]
Here d(tsint)/dt = t d(sint)/dt + sint d(t)/dt
= t cost + sint
d(et)/dt = et;
d(t+π)/dt = 1 since π is constant.
So
r'(t) = [tcost + sint, et, 1].
Option e is correct.
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