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If `t a nalpha,t a nbeta,t a ngamma` are the roots of the equation `x^3-p x^2-r=0,` then the value of `(1+tan^2alpha)(1+tan^2beta)(1+tan^2gamma)` is equal to `(p-r)^2` b. `1+(p-r)^2` c. `1+(p-r)^2` d. none of these

A

`(p - r)^(2)`

B

`1 + (p - r)^(2)`

C

`1 - (p - r)^(2)`

D

None of these.

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The correct Answer is:
B
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