What is tan5°?

A. Positive Integer

B. A rational Number

C. An Irrational Number

D. Negative Integer

I solved the value of tan5° but isn't there another way of finding out weather tan5° is rational or irrational as it cannot be an positive or negative integer cause tan0 = 0 tan45 = 1 since tan5 is between them tan5 is not equal to integer but how to identify weather it is rational or irrational???

Ans : Irrational Number