Let bar(a),bar(b) be two non-collinear u...

Let `bar(a),bar(b)` be two non-collinear unit vectors, if `bar(alpha) = bar(a) -(bar(a).bar(b))bar(b)` and `bar(beta) = bar(a) xx bar(b),` then show that `|bar(beta)| = |bar(alpha)|`.

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If bar(a).bar(b) = bar(a).bar(c ) and bar(a) xx bar(b) = bar(a) xx bar...
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