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+2 votes
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in Sets, relations and functions by (50.2k points)

If cos-1x + cos-1y + cos-1z = π prove that x2 + y2 + z2 + 2xyz = 1

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+2 votes
by (54.5k points)
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Best answer

We have

cos-1x + cos-1y + cos-1z = π

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