13-77-154 Solution

The Problem:

Evaluate the following algebraic expression without using a calculator, slide rule, or computer, and without evaluating any trigonometric functions:

sin(13°) * sin(77°) / sin(154°)

This should actually be a super-easy problem for anyone who knows basic trig identities.

But if you're having a hard time and want to see the solution, see here:

Written Sat Aug 21, 2021 by Robbie Hatley.

Last updated Mon Jul 18, 2022.