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Question

If sin1x+sin1y+sin1z=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 C 2
sin1(x)+sin1(y)=πsin1(z)
sin1(x1y2+y1x2)=πsin1(z)
x1y2+y1x2=z
x2(1y2)+y2(1x2)+2xy(1x2)(1y2)=z2
x2+y22x2y2+2xy(1x2)(1y2)=z2
x2+y2z2=2x2y22xy(1x2)(1y2)
Squaring and simplifying, we get
x4+y4+z4+4x2y2z2=2(x2y2+z2y2+x2z2)

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