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If, in a /\PQR, right angled at R, tan...

If, in a `/_\PQR`, right angled at R,
`tan (P/2) and tan (Q/2)` are the roots of the equation `ax^(2) + bx + c = 0 , a!= 0`, then

A

b = c

B

b = a + c

C

a = b + c

D

c = a + b

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The correct Answer is:
D
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