What is the angle between P and the resultant of (P + Q) and (P - Q)?
Zero
tan-1(P/Q)
tan-1(Q/P)
tan-1(P-Q) / (P+Q)
Resultant of (P+ Q) and (P - Q) is P + Q + P - Q or 2Pwhich is parallel to P.So, angle between P and 2P will be zero.