Sec^2 A =(4xy)/(x+y)^2 where x € r , y € r is true only if --- a) x + y is not equal to 0
b) x=y , x not equal to 0
c) x= y
d) x not equal to 0 , y not equal to 0 .
b) x=y , x not equal to 0
c) x= y
d) x not equal to 0 , y not equal to 0 .
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