by Guest » Fri Nov 25, 2016 6:42 am
The sum of two continuous functions are continuous, and the composition of continuous functions is continuous.
So the answer is yes, to both questions.
The only non-continuous function in your questions is tan (all the others are continuous everywhere), and you are looking at tan at the pi/4 point where it is locally continuous, so you are fine.
Hope this helped,
R. Baber.