3 years ago

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

2 answers:

7 0

Answer:

Step-by-step explanation:

-1/2

7 0

Answer:

B -1/2

Step-by-step explanation:

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Romashka [77]

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Sav [38]

Answer:

90 cubic inches

Step-by-step explanation:

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grin007 [14]

Answer: 81 mm^2

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