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babymother [125]
3 years ago
5

What is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)sin(pi/7)?

Mathematics
2 answers:
Anika [276]3 years ago
7 0

Answer:

B

Step-by-step explanation:

-1/2

arsen [322]3 years ago
7 0

Answer:

B -1/2

Step-by-step explanation:

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