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If cos^-1x + cos^-1y + cos^-1z = π prove that x^2 + y^2 + z^2 + 2xyz = 1

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in JEE by kratos

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

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+1 vote
by kratos
 
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We have

cos-1x + cos-1y + cos-1z = π

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