Question 25
In a triangle $ABC$ we have $|BC| + |AC| = 2|AB|$ and $\angle BAC - \angle CBA = 90^\circ$.
Determine the cosine of the angle $\angle ACB$.
Determine the cosine of the angle $\angle ACB$.
MathNet 2015-part-02 — 191 problems (EN–VI) Question 25
Math Olympiad Vault · MathNet 2015-part-02 — 191 problems (EN–VI)