jtkgotosleep123 jtkgotosleep123

01-12-2020
Mathematics

contestada

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

a. -squr3/2
b. -1/2
c. 1/2
d. squr3/2

Respuesta :

funnymunchies2004 funnymunchies2004

07-12-2020

Answer:

B

Step-by-step explanation:

-1/2

Answer Link

camjjwo camjjwo

12-06-2021

Answer:

B -1/2

Step-by-step explanation:

Answer Link

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