Mathematics, 01.12.2020 22:20 lovelarissa

What is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)s in(pi/7)? a. -squr3/2
b. -1/2
c. 1/2
d. squr3/2

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What is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)s in(pi/7)? a. -squr3/2
b. -1/2<...