If \( P \) and \( Q \) have different non-zero dimensions.
\( \math... VIDEO
If \( P \) and \( Q \) have different non-zero dimensions.
\( \mathrm{P} \) which of the following operation is possible:
(A) \( P^{2}+Q^{2} \)
(B) \( P Q^{2} \)
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(C) \( \quad P^{2}-Q^{2} \)
(D) All of these
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