Question 250620
We start with
{{{sin(pi-X) = 1}}}.
Here is one way. Replace (pi-X) with A.
We have
{{{Sin(A) = 1}}}.
At what values of A is the sin = 1?
{{{A = pi/2}}} only.
Substitute (pi-X) back for A and we get
{{{PI-X = pi/2}}}.
Solving for X, we get
{{{X = pi/2}}}.