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In a triangle PQR, PS is the angle bisec...

In a triangle PQR, PS is the angle bisector of `angle QPR` and `angle QPS = 60^(@)`. What is the length of PS?

A

`sqrt(y^(2) + z^(2))`

B

`(y+z)/(yz)`

C

`(yz)/(y+z)`

D

`((y+z)^(2))/(yz)`

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