If sin-' x + sin-'y + sin-'z = 5, then the value of x² + y2 + 32 + 2xyz is equal to (a) o (b) 1 (c) 2. (d) 3

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anly colon ( x=y=2=frac{1}{2} frac{1}{2}=frac{sin ^{-1} frac{1}{2}}{frac{1}{4} / 6} ) ( =frac{1}{4}+frac{1}{4}+frac{1}{4}+2 times frac{1}{2} times frac{1}{2} times frac{1}{2} ) ( =frac{3}{4}+frac{7}{4} ) ( =frac{4}{4}=1 )

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