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<...
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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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Answers: 3
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