undefined equation.
sin (pi/2 – x) = cos x (supplementary arc)
##cot (pi/2 + x) = (cos (pi/2 + x))/(sin (pi/2 + x)) = sin x/(-cos x).##
The left side of the equation simplifies to:
##(cos x)(sin x/(-cos x)) = – sin x##
Then the equation reduces to:
-sin x = – sin x
The equation is undefined. It is insolvable.