Mock AIME 2 Pre 2005 Problems/Problem 11
,
, and
are the roots of
. Let
The value of
can be written as
where
and
are relatively prime positive integers. Determine the value of
.
Solution
We know that are the roots of
. By Vieta's formulas, we have:
Now, by tangent addition formulas, we have . Substituting Vieta's formulas, we obtain
. Therefore, our answer is
and we are done.
See also
Mock AIME 2 Pre 2005 (Problems, Source) | ||
Preceded by Problem 10 |
Followed by Problem 12 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 |