Question 768721
Assuming you meant to write:

{{{
tan(sin^-1 (p/sqrt (p^(2)+9)))
}}}

t=p/sqrt (p^(2)+9))
note that sin(t)=p/r

and r=sqrt (p^(2)+9)

from which we see that x=3, y=p

and so

tan(t) = p/3