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Tom [10]
2 years ago
14

100 POINTS AND BRAINLIEST!! PRE CALC!

Mathematics
1 answer:
Shkiper50 [21]2 years ago
4 0

Answer:

b

Step-by-step explanation:

use cos(r + s ) = cosrcoss - sinrsins to expand.

cos pi/3 cosx - <u>sin pi/3 sinx</u> + cos pi/3 cosx + <u>sin pi/3 sinx</u>

the two in bold cancel out.

cospi/3 cosx + cospi/3 cosx

pi = 180° in trigonometry.

cos 180/3 cosx + cos 180/3 cosx

1/2 cosx + 1/2 cosx

= cos x

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Below!

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