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Answer on Analytic Geometry Question for john.george.milnor

Question #12458
Prove identity: [a,b]^2+(a,b)^2=|a|^2 * |b|^2, where a and b are vectors
Expert's answer
Using cos^2(x)+sin^2(x)=1
and squaring two previuos equalities we obtain
necessary result.

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