Ответ:
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Объяснение:
<span>3 arcsin(-1) -3/2 arccos(√3/2)-7,5 arctg(-1/√3) = 3*(-</span>π/2<span>) -1,5*</span>π/6 +7,5*π/6 =
= - 3π/2 - π/4 +5π/4 = -1,5π +π = -0,5π
(7 1//3-6 7//8):3//4+8 8//9*2 1//80=11//24:3//4+(8 8//9*2 1//80=11//18+80//9*2 1//80=11//18+161//9=18.5
18.5=37//2
Обратное число: 2//37
// - черта дроби
X^2 = 49
x = ± 7
Ответ:
x = ± 7
1) соs 2a = 1 - 2sin^2 a = 1- 2(-8/17)^2 = 161/289