Use an Addition or Subtraction Formula to Write $\frac { \tan \frac { 2 \pi } { 15 } + \tan \frac { 6 \pi } { 5 } } { 1 - \tan \frac { 2 \pi } { 15 } \tan \frac { 6 \pi } { 5 } }$

question 43

Essay

Use an addition or subtraction formula to write $\frac { \tan \frac { 2 \pi } { 15 } + \tan \frac { 6 \pi } { 5 } } { 1 - \tan \frac { 2 \pi } { 15 } \tan \frac { 6 \pi } { 5 } }$ and find the exact value.

---

Definitions:

Corticosteroids

A class of steroid hormones that are produced in the adrenal cortex and are used medicinally to reduce inflammation and suppress the immune system.

Cytokines

Small proteins that are crucial in controlling the growth and activity of other immune system cells and blood cells.

Behavioral Medicine

An interdisciplinary field combining both medicine and psychology to develop and apply various behavioral and psychological approaches to treatment and the improvement of patients' health.

Relaxation Training

A therapeutic technique that teaches individuals how to effectively manage stress and anxiety through relaxation methods such as deep breathing, progressive muscle relaxation, or meditation.