Let \( |a|=3 \) and \( |b|=4 \). The value of \( \mu \) for which the vectors \( a+\mu b \) and ....

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Let \( |a|=3 \) and \( |b|=4 \). The value of \( \mu \) for which the vectors \( a+\mu b \) and \( a-\mu b \) will be perpendicular is
\( \mathrm{P} \)
(1) \( 3 / 4 \)
(2) \( 2 / 3 \)
W
(3) \( -5 / 2 \)
(4) \( -2 / 3 \)


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