calculate vector product a X b... in three dimensions
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Example: The cross product of a = (2,3,4) and b = (5,6,7)
cx = aybz − azby = 3×7 − 4×6 = −3
cy = azbx − axbz = 4×5 − 2×7 = 6
cz = axby − aybx = 2×6 − 3×5 = −3
Answer: a × b = (−3,6,−3)
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