My work, LSH:
= | a × b |² + (a • b)²
= (|a||b|sinθ)(|a||b|sinθ) + (|a||b|cosθ)(|a||b|cosθ)
You can write this as:
|a|^2|b|^2[sin^2(theta) + cos^2(theta)]
The result follows from the fact that
sin^2(theta) + cos^2(theta) = 1
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