Trigonometry Examples

$\cos (a + b) \cdot \sin (a - b) = \sin (a) \cdot \cos (a) - \sin (b) \cdot \cos (b)$

Step 1

Graph.

$\cos (a + b) \cdot \sin (a - b) = \sin (a) \cdot \cos (a) - \sin (b) \cdot \cos (b)$

Step 2