Question 889775
it appears that the solution will be undefined when sin(x) - cos(x) = 0.
that occurs when sin(x) = cos(x)
that will happen in the first quadrant and the third quadrant.
cosx and sinx are both positive in quadrant 1
cosx and sinx are both negative in quadrant 3
sinx is equal to cosx when the angle in quadrant 1 is 45 degrees.
sinx is equal to cosx when the angle in quadrant 3 is 225 degrees.
those should be your solutions.