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((7\pi)/(6))`

Step 2:

Step 3

`cos((7\pi)/(6))\text{ = -cos\lparen}(\pi)/(6)\text{\rparen= -cos30}\degree\text{ = -}(√(3))/(2)`

Final answer

`-(√(3))/(2)`