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In triangle PQR,squareQ=90^o, squareR=x^...

In triangle `PQR,`squareQ=90^o`, `squareR=x^o`. Lengths of the sides `PQ`, `QR` and `PR` are a,b,c respectively.
Which among the following is `tanx^0`
`(a/c,b/a,a/b,b/c)`
.

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