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Are you looking for formulas for polar co-ordinate conversions for calculating bearings?
Assuming X in A1 and Y in B1:
Distance: =SQRT(A1^2+B1^2)
Bearing (radians): =ATAN(B1/A1)
Bearing (degrees): =DEGREES(ATAN(B1/A1))
If you need to find X and Y from the distance (in A2) and radian bearing (in B2):
X: =A2*COS(B2)
Y: =A2*SIN(B2)
and if the bearing is in degrees:
X: =A2*COS(RADIANS(B2))
Y: =A2*COS(RADIANS(B2))
HTH
Steve D. Demonstration file available on request.