Find all the angles Theta, with 0 <=theta<=2pie radians, that satisfy each equation.
(Use radians not degrees. Round your answers to four decimal
places. Separate multiple answers with a comma.)
(a) sin theta = -1
(b) cos theta = 1
(c) sin theta = 0.4
(d) cos theta = -0.6
(e) tan theta = -2.5