Need Help With the maths for a space game

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SSS

hi all, i just, 5 minuits ago started a spaceship/shooting game and already i am stuck :D anyway the problem is with the rotation of ships, it rotates fine but it won't do accumulated rotation i know why it does it but i dont know how to solve it, i havnt gotten up to vector mathmatics or the like in maths yet....
thanks alot for any help here is my code


Include "def.bb"

Global Camera
Initialize()
PositionEntity Camera, 0,5,-20
player.Ship = CreateShip("Ships\test.ship")
PositionMesh player\Model,0,MeshHeight#(player\Model)/2,0


While Not KeyDown(1)

	If KeyDown(200) Then player\Rotation\x = player\Rotation\x+3
	If KeyDown(208) Then player\Rotation\x = player\Rotation\x-3
	If KeyDown(203) Then player\Rotation\z = player\Rotation\z+3
	If KeyDown(205) Then player\Rotation\z = player\Rotation\z-3
	RotateEntity player\Model,player\Rotation\x,player\Rotation\y,player\Rotation\z
	RenderWorld()
	Flip()
Wend