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If s e c^2theta=(4x y)/((x+y)^2) is true...

If `s e c^2theta=(4x y)/((x+y)^2)` is true if and only if (a)`x+y!=0` (b) `x=y , x!=0` (c) `x=y` (d) `x!=0,y!=0`

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`sec^2theta=(4xy)/(x+y)^2`
`sec^2theta>=1`
`(4xy)/(x+y)^2>=1`
`(x+y)^2<=4xy`
`(x+y)^2-4xy<=0`
`(x-y)^2<=0`
For real values of x and y
`(x-y)^2>=0`
...
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