Trigonometric Identities

Phase rotation table of sin and cos

fi [rad]	fi [deg]	cos(x+fi)	sin(x+fi)	cos(fi-x)	sin(fi-x)
-pi	-180	-cos(x)	-sin(x)	-cos(x)	sin(x)
-pi/2	-90	sin(x)	-cos(x)	-sin(x)	-cos(x)
0	0	cos(x)	sin(x)	cos(x)	-sin(x)
+pi/2	90	-sin(x)	cos(x)	sin(x)	cos(x)
+pi	180	-cos(x)	-sin(x)	-cos(x)	sin(x)