Theorem. r(t)=(f(t),g(t),h(t)) is continuous at t=a if and only if all of f,g,h are continuous at t=a.
f(t)=t3+4 is continuous everywhere,
g(t)=et is continuous everywhere,
h(t)=cos(t) is continuous everywhere.
The vector valued function r(t)=(t3+4,et,cos(t)) is
a. continuous for all t∈R
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