If sin−1x+sin−1y+sin−1z=π, then x4+y4+z4+4x2y2z2=k(x2y2+y2z2+z2x2), where k is equal to
A
1
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B
2
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C
4
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D
noneofthese
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Solution
The correct option is C2 sin−1(x)+sin−1(y)=π−sin−1(z) sin−1(x√1−y2+y√1−x2)=π−sin−1(z) x√1−y2+y√1−x2=z x2(1−y2)+y2(1−x2)+2xy√(1−x2)(1−y2)=z2 x2+y2−2x2y2+2xy√(1−x2)(1−y2)=z2 x2+y2−z2=2x2y2−2xy√(1−x2)(1−y2) Squaring and simplifying, we get x4+y4+z4+4x2y2z2=2(x2y2+z2y2+x2z2)