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For any two real number theta and phi we...

For any two real number `theta` and `phi` we define `theta phi` if and only if `sec^2theta - tan^2theta=1` .the relation R is

A

reflexive but not transitive

B

symmetric but not reflexive

C

both reflexive and symmetric but not transitive

D

an equivalence relation

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The correct Answer is:
D
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