CBSE

MATHEMATICS · Single correct · CBSE · Mathematics · Inverse Trigonometric Functions · Inverse Trigonometric Functions

Problem

If cos⁡−1x+cos⁡−1y+cos⁡−1z=π\cos^{-1}x+\cos^{-1}y+\cos^{-1}z=\pi, then (a) x2+y2+z2+xyz=0x^2+y^2+z^2+xyz=0 (b) x2+y2+z2+2xyz=0x^2+y^2+z^2+2xyz=0 (c) x2+y2+z2+xyz=1x^2+y^2+z^2+xyz=1 (d) x2+y2+z2+2xyz=1x^2+y^2+z^2+2xyz=1

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