Determine the unghle betwwen: P1:x+y-z-1=0 P2:x+2y-7=0 when P=Plan

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Hi One normal vector to P1 has coordinates (1,1,-1) which are the coefficients of x, y and z in P1 equation One normal vector to P2 has coordinates (1,2,0) The angle between P1 and P2 is the same as the one between and The dot product is Which gives

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