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If tan alpha, tan beta, tan gamma are th...

If `tan alpha, tan beta, tan gamma` are the roots of the equation `x^(3)-px^(2)-r=0`, then the value of `(1+tan^(2)alpha)(1+tan^(2)beta)(1+tan^(2)gamma)` is equal to

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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