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

D 121312 Use The Unit Circle To Find Cos 7 AS Sbo 12d 12 class=

Sagot :

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]

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