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The distance between the points (a cos t...

The distance between the points `(a cos theta, a sin theta)` and `(a cos varphi, a sin varphi)` is `2 a`, then `theta=`

A

`2 n pi pm pi+varphi, n in z`

B

`n pi+(pi)/(2)+varphi, n in z`

C

`n pi-varphi` `n in z`

D

`2 n pi+varphi, n in z`

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A
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