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In a triangle PQR angle R=(pi)/(4),...

In a triangle ` PQR angle R=(pi)/(4),` if `tan (p/3) and tan ((Q)/(3))` are the roots of the equation `ax ^2 + bx +c=0` then

A

`a+b=c`

B

`b+c=0`

C

`a+c=0`

D

`b=c`

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The correct Answer is:
A
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