Answer to Question #116788 in Calculus for Olivia

Question #116788
The vector valued function r(t)=⟨t^3+4,e^t,cos(t)⟩

is
Select one:
a. continuous for all t∈R

b. only continuous for t∈[0,∞)


c. continuous for all t
except 0
d. only continuous at t=π


e. only continuous for t∈[1,∞)
1
Expert's answer
2020-05-19T19:10:34-0400

Theorem. r(t)=(f(t),g(t),h(t))r(t)=\big(f(t), g(t), h(t)\big) is continuous at t=at=a if and only if all of f,g,hf, g, h are continuous at t=a.t=a.

f(t)=t3+4f(t)=t^3+4 is continuous everywhere,

g(t)=etg(t)=e^t is continuous everywhere,

h(t)=cos(t)h(t)=\cos(t) is continuous everywhere.

The vector valued function r(t)=(t3+4,et,cos(t))r(t)=\big(t^3+4, e^t, \cos(t)\big) is

a. continuous for all t∈R 




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