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that depends, are you talking money wise, then rounding up might be best, but technically you would round it down, sine its below 21.5.
A periodic up-and-down motion.
Yes. It continues forever, though repeating itself which is what makes a sign graph go up and down.
sine 810 = sine 90 = 1
Sine(A+ B) = Sine(A)*Cosine(B) + Cosine(A)*Sine(B).