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In a triangle PQR " if " angle R =...

In a triangle `PQR " if " angle R = (pi)/(2)` if tan `(P/2)`and `tan (Q/2)` are the roots of ` ax^2 +bx +c=0 , a ne 0` then

A

`b=a +c `

B

`b=c`

C

`c=a+b`

D

`a=b+c`

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The correct Answer is:
C
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