Ответ:
Объяснение:
1) =√18(cos²15π/8 -sin²15π*8)=√18·cos15π/4 = √18·cos(4π - π/4) =√18·cos(2π - π/4) =√18·cos π/4=√18 · √2/2=√36/2=3
2) =√27 -2√27 · sin²11π/12=√27 · (1 - 2sin²11π/12)=√27 · (1 - (1-Cos 22π/12)) =√27 · Cos 11π/6=√27 · Cos (2π - π/6) =√27 · Cos π/6 =√27 · √3/2 =√81/2= 9/2=4,5
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Ответ:
Объяснение:
1) =√18(cos²15π/8 -sin²15π*8)=√18·cos15π/4 = √18·cos(4π - π/4) =√18·cos(2π - π/4) =√18·cos π/4=√18 · √2/2=√36/2=3
2) =√27 -2√27 · sin²11π/12=√27 · (1 - 2sin²11π/12)=√27 · (1 - (1-Cos 22π/12)) =√27 · Cos 11π/6=√27 · Cos (2π - π/6) =√27 · Cos π/6 =√27 · √3/2 =√81/2= 9/2=4,5