Find the domain of the vector functions,r(t), listed below.You may use "-INF" for ?? and use "INF" for ? as necessary, and use"U" for a union symbol if a union of intervals is needed.

a)r(t)=?ln(6t),?t+16,1/?10?t?

b)r(t)=??t?9,sin(6t),t^2?

c)r(t)=? e^?9t,t/?t^2?36,t^1/3?

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