Given, \( |\mathbf{A}+\mathbf{B}|=P,|\mathbf{A}-\mathbf{B}|=Q \). The value of \( P^{2}+Q^{2} \)...
Given, \( |\mathbf{A}+\mathbf{B}|=P,|\mathbf{A}-\mathbf{B}|=Q \). The value of \( P^{2}+Q^{2} \) is
(a) \( 2\left(A^{2}+B^{2}\right) \)
(b) \( A^{2}-B^{2} \)
(c) \( A^{2}+B^{2} \)
(d) \( 2\left(A^{2}-B^{2}\right) \)
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