Exercise - 1.5

Choose the correct or the most suitable answer. . If A = { ( x, y ) : y = e x , x ∈ R } and B = { ( x, y ) : y = e − x , x ∈ R } then n ( A ∩ B ) is ( ) Infinity ( ) ( ) . If A = { ( x, y ) : y = sin x, x ∈ R } and B = { ( x, y ) : y = cos x, x ∈ R } then A ∩ B contains ( ) no element infinitely many elements ( ) only one element ( ) cannot be determined. . The relation R defined on a set A = { , − , , } by xRy if | x + y | ≤ , then which one of the following is true? ( ) R = { ( , ) , ( , − ) , ( , ) , ( − , ) , ( − , ) , ( , ) , ( , ) }