With \( A, B, C \) as in Question No. 18, define \( o \) as follows... VIDEO
With \( A, B, C \) as in Question No. 18, define \( o \) as follows:
\( A o B=\frac{1}{2}\left(A B^{\prime}-B A^{\prime}\right) \), then
(a) \( A o A=O \)
(b) \( A o I=O \)
(c) \( A o(B+C)=A o B+A o C \)
(d) none of these
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