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

User Lee Harrison
by
3.7k points

2 Answers

5 votes
The answer is -1/2 !!!
User Tbischel
by
4.0k points
2 votes

Answer:


- (1)/(2)

Explanation:

cos

(

π

+

π

3

)

=

cos

π

⋅

cos

(

π

3

)

−

sin

π

⋅

sin

(

π

3

)

=

(

−

1

)

(

1

2

)

−

(

0

)

(

√

3

2

)

=

−

1

2

User Pauljeba
by
4.4k points
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