Step 1
Write the trigonometric expression
[tex]cos(\frac{7\pi}{6})[/tex]
Step 2:
Step 3
[tex]cos(\frac{7\pi}{6})\text{ = -cos\lparen}\frac{\pi}{6}\text{\rparen= -cos30}\degree\text{ = -}\frac{\sqrt{3}}{2}[/tex]
Final answer
[tex]-\frac{\sqrt{3}}{2}[/tex]
