1. The curve C is defined by

${e}^{sinxy}=1\{y>0\}$

Points A and B have coordinates $(\frac{ \pi }{2},2)$ and $(-\frac{ \pi }{2},2)$ respectively.

The tangents to C at points A and B intersect at the point P. The tangent to C at point A intersects the x-axis at point Q. The tangent to C at point B intersects the x-axis at point R.

Find the area of triangle PQR.