cosx - sinx + 6sinxcosx = 1
6sin (x) cos (x) + 2sin (x) - 3cos (x) - 1
2 * sin (x) * (3cos (x) + 1) - 1 * (3cos (x) + 1) = 0
(3cos (x) + 1) * (2sin (x) - 1) = 0
3cos (x) + 1 = 0
3cos (x) = -1
cos (x) = -1/3
x = +/- 109,471 * pi / 180
2sin (x) - 1 = 0
2sin (x) = 1
sin (x) = 1/2
x = pi / 6, 5pi / 6
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