Question

How do I get the fractional form for cos 4π/3?

Answer 1

Answer:

$- \frac{1}{2}$

Step-by-step explanation:

cos

(

π

+

π

3

)

=

cos

π

⋅

cos

(

π

3

)

−

sin

π

⋅

sin

(

π

3

)

=

(

−

1

)

(

1

2

)

−

(

0

)

(

√

3

2

)

=

−

1

2

Answer 2

The answer is -1/2 !!!