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If coses `0=(x^(2)-Y^(2))/(x^(2)+Y^(2))` is true iff-

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If coses `0=(x^(2)-Y^(2))/(x^(2)+Y^(2))` is true iff-
A. `x= y pm 0`
B. `x lty`
C. `x gt y`
D. none of these
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Correct Answer - D
`"cosec"0 ge 1 "here" x^(2)-y^(2) le x^(2) +Y^(2)`(always)
`"cosec"0 le -1` solution possible iff
`x=0 " "......(i)`
`& y=0 " "......(ii)`
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