In any triangle

MATHEMATICS · Single correct · ISC · Mathematics · Sets and Functions · Sets and Functions

Problem

In any triangle

ABC

, if

\cot\frac{A}{2}

\cot\frac{B}{2}

, and

\cot\frac{C}{2}

are in AP, then

A

B

, and

C

are in (1) AP (2) GP (3) HP (4) None of these