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Guf08
@Guf08
August 2022
2
8
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Найти значение выражений: 1)14•sin174 градусов/sin87 градусов•sin3 градусов; 2)-4•sin142*/cos71*•cos19*; 3)18•sin45*•cos135*;
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artalex74
Все значения аргумента - в градусах
1)
2)
3)
18sin45cos135 = 18sin45cos(180-45) = 18sin45·(-cos45) = -9sin90 = -9·1 = -9
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sedinalana
14sin(180-6)/sin(90-3)*sin3=14sin6/cos3*sin3=28sin6/sin6=28
-4sin(180-38)/cos(90-19)*cos19=-4sin38/sin19*cos19=-8sin38/sin38=-8
18sin45*cos(180-45)=18sin45*(-cos45)=-18/2*sin90=-18/2*1=-9
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Answers & Comments
1)
2)
3)
18sin45cos135 = 18sin45cos(180-45) = 18sin45·(-cos45) = -9sin90 = -9·1 = -9
-4sin(180-38)/cos(90-19)*cos19=-4sin38/sin19*cos19=-8sin38/sin38=-8
18sin45*cos(180-45)=18sin45*(-cos45)=-18/2*sin90=-18/2*1=-9