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In a triangle PQR angle R=pi //2 if ...

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

A

`a+b=c`

B

`b+c=a`

C

`a+c=b`

D

`b=c`

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The correct Answer is:
A
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