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senioramelin20
@senioramelin20
May 2021
1
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Допоможіть обчислити Cos ( 11пі/12)- СOS (5пі/12)
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zarembo73
Cos(11π/12)-cos(5π/12)=-2sin((11π/12+5π/12)/2)*sin((11π/12-5π/12)/2)=
=-2sin(16π/24)*sin(6π/24)=-2sin(2π/3)*sin(π/4)=-2*√3/2*√2/2=-√6/2.
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senioramelin20
Спасибо)))
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Answers & Comments
=-2sin(16π/24)*sin(6π/24)=-2sin(2π/3)*sin(π/4)=-2*√3/2*√2/2=-√6/2.