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For any two real numbers theta and varph...

For any two real numbers `theta` and `varphi`, we define `thetaR varphi` if and only if `sec^(2)theta-tan^(2)varphi=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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