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<p><span style="color: #006600;"><strong>Si dues rectes de vectors directors (a,b) i (c,d) són perpendiculars, {1:MC: ~ad-bc ~=ac+bd} = 0.</strong></span></p>

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by Admin User on Thursday, 23 August 2018, 4:18 PM 

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by Admin User on Thursday, 23 August 2018, 4:18 PM 

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