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Property 9 (i) (-a1) xx (-a2) xx (-a3) x...

Property 9 (i) `(-a_1) xx (-a_2) xx (-a_3) xx ........ xx (-a_n)=(a_1 xx a_2 xx a_3 xx ..... xx a_n)` if `n` is even (ii) `(a_1) xx (-a_2) xx (-a_3) xx ...... xx (-a_n)=-(a_1 xx a_2 xx a_3 xx ..... xx a_n)` if `n` is odd

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