This cannot be done. In this case there is no way of expressing in terms of x. However, you do not need to solve for x to get an answer.I do not know how to solve for x, in order to get it alone, because of the tan[(pi)(x/2)].
It sounds like you have already got to
Now substitute x = 3 to get
It is easy to see that y = 0 is a solution to this, just by recognising that tan (0) = 0.
You are expected to know thatb.) Find f(f^-1(5)).