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In a triangle PQR, /R = pi//2, If tan(P/...

In a triangle PQR, `/_R = pi//2`, If `tan(P//2).` and `tan(Q//2)` are the roots of the equation : `ax^(2) + bx + c = 0 ``a != 0`, then :

A

`a+b=c`

B

`b+c=0`

C

`a+c=b`

D

`b=c`

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The correct Answer is:
A
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