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P (8,-6)<---->P'(2.12-x,y) = P" (2.12 - 8 , -6) = P ( 24-8 , -6 )
= P ( 16, -6 )
P(16,-6) dicerminkan trhdp grs. y = x maka :
P(16, -6)<----->P'(y,x) = P'(-6,16) jwbnnya