1 - COS(x)·COT(x) + SIN(x) = 0
1 - COS(x)·COS(x)/SIN(x) + SIN(x) = 0
SIN(x) - COS(x)·COS(x) + SIN(x)^2 = 0
SIN(x) - COS(x)^2 + SIN(x)^2 = 0
SIN(x) - (1 - SIN(x)^2) + SIN(x)^2 = 0
SIN(x) - 1 + SIN(x)^2 + SIN(x)^2 = 0
2·SIN(x)^2 + SIN(x) - 1 = 0
2·z^2 + z - 1 = 0 --> z = 0.5 ∨ z = -1
SIN(x) = 0.5 --> x = 5/6·pi ∨ x = pi/6
SIN(x) = -1 --> x = 3/2·pi
Das sind jetzt nur die Grundlösungen im Intervall [0 ; 2·pi].