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Question

For any two real numbers θ ϕ, we define θRϕ if and only if sec2θtan2ϕ=1. The relation R is

A
Reflexive but not transitive
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B
Symmetric but not reflexive
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C
Both reflexive and symmetric but not transitive
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D
An equivalence relation
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Solution

The correct option is D Both reflexive and symmetric but not transitive
Given ,θ Rϕ where θ and ϕ are two real numbers.
sec2θtan2ϕ=1
θ=ϕ
R is reflexive and symmetric.
R is not transitive since there are only two numbers.


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