Question

cosA = x^2 - y^2 / x^2 + y^2
where x € r and y; € r gives real number A if and only if ---
a) x= y not equal 0
b) l x l = l y l not equal 0
c) x + y = 0 , x not equal 0
d) none of these pls give chose the correct option .with explanation . ​
pls give the answer fast .

Answer 1

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Answer 2

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