Question

d. 12/1312. Use the unit circle to find cos ( 7 )a.S S/-b.o. 1/2d. -1/2

Answer 1

Step 1

Write the trigonometric expression

$cos(\frac{7\pi}{6})$

Step 2:

Step 3

$cos(\frac{7\pi}{6})\text{ = -cos\lparen}\frac{\pi}{6}\text{\rparen= -cos30}\degree\text{ = -}\frac{\sqrt{3}}{2}$

Final answer

$-\frac{\sqrt{3}}{2}$