Question

express sin 5x-sin 4x as a product of trigonometrc function

Answer 1

➡HERE IS YOUR ANSWER⬇

$sin5x - sin4x \\ \\ = 2cos( \frac{5x + 4x}{2} )sin( \frac{5x - 4x}{2} ) \\ \\ = 2cos \frac{9x}{2} sin \frac{x}{2}$

⬆HOPE THIS HELPS YOU⬅