1.

Let A, B C be three angles such that A = pi/4 and tan B tan C = p. Set of all possible values of p such that A, B , C are angles of a triangle.

Answer»

`(- infty, infty)`
`(- infty, 0)`
`(3 + 2 SQRT2, infty)`
`(- infty, 0) CUP [3 + 2 sqrt2, infty)`

Answer :D


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