Trigonometri Contoh

$\frac{\cos (2 x)}{\cos (x) + \sin (x)} + \frac{\sin (2 x)}{\cos (x) - \sin (x)} = \frac{1}{\sqrt{2} \cos (45 + x)}$

Langkah 1

Persamaan yang disediakan bukan identitas.

$\frac{\cos (2 x)}{\cos (x) + \sin (x)} + \frac{\sin (2 x)}{\cos (x) - \sin (x)} = \frac{1}{\sqrt{2} \cos (45 + x)}$ bukan identitas