Trigonometry Examples

$\cos^{2} (a) - \sin^{2} (a) = \frac{2 \cos^{2} (a) \cdot \tan (a)}{\tan (2 a)}$

Step 1

Graph each side of the equation.

$y = \cos^{2} (a) - \sin^{2} (a)$

$y = \frac{2 \cos^{2} (a) \cdot \tan (a)}{\tan (2 a)}$

Step 2