Verify a×b=b×a / a=-3/4 b=-12/5
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Answer:
|a×b| =|(-3/4) ×(-12/5)|=|3/5|=3/5
|a|×|b|= |-3/4|×|-12/5|= 3/4×12/5=3/5
thus,it is verified that |a×b|=|a|×|b|
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