Given these two angles:
![(5\pi)/(4)](https://img.qammunity.org/2023/formulas/mathematics/high-school/i5mn5go5u4q73zhongp67v9mde3tjb2bz7.png)
![-(3\pi)/(4)](https://img.qammunity.org/2023/formulas/mathematics/high-school/d9uncmz5aphfohhkfy8jvukgcw8s23chy2.png)
You need to remember that, by definition, two angles are coterminal if the Difference (the result obtained by subtracting them) is:
![360\text{\degree or }2\pi](https://img.qammunity.org/2023/formulas/mathematics/college/sdjagjafjzrjl89cy43ok1xw6c12bg17u8.png)
Then, you need to set up:
![(5\pi)/(4)-(-(3\pi)/(4))](https://img.qammunity.org/2023/formulas/mathematics/college/un1mu1wfea2iolghxyouuiht3x75wt2s1p.png)
Solving the Subtraction, you get:
![=(5\pi)/(4)+(3\pi)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/l73p1hci3nicfcg6kcu2fplzfakrlv7dcl.png)
![=(8\pi)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/ov4e9fsaab4tmyaq932coux3ypcgnoqc6q.png)
![=2\pi](https://img.qammunity.org/2023/formulas/mathematics/college/k70qahuob8g8b45xlt4tf10pqpmqnsqb2g.png)
Hence, the answer is: They are Coterminal Angles.