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The gure gives, for three situations, the displacements x(t) of a pair of simple harmonic oscillators (A and B) that are identical except for phase. For each pair, what phase shift (in radians and in degrees) is needed to shift the curve for A to coincide with the curve for B? Of the many possible answers. choose the shift with the smallest absolute magnitude. (b) (C) {a} +1T rad or +180" {l3} +Tr/2 rad or +90 {6} 41/2 rad or -90 -TT/2 rad or -90 +IT/2 rad or +90 +TI rad or +180