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

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

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1 Answer

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Best answer

cos-1x + cos-1y + cos-1z = π

(According to question)

cos-1x + cos-1 y = π – cos-1z

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