568 karma · joined August 12, 2013
def get_species(): return 'Canis familiaris'
(ad + bc) = ((a + b) × (c + d)) – ac – bd.
First note this equation is more clearly be written as:
ad + bc = (a + b)(c + d) – ac – bd.
To see why this is so first expand (a + b)(c + d).
(a + b)(c + d) = ac + ad + bc + bd
now
(a + b)(c + d) − ac − bd = ac + ad + bc + bd − ac − bd
Hence
ad + bc = (a + b)(c + d) – ac – bd.
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