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380977387562
@380977387562
July 2022
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1. cosx=-3
2. 1+cos5x=1
3. cos (x-П/3)=1
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Verified answer
1. cosx = -3 - не имеет решения, т.к. косинус аргумента принадлежит отрезку [-1; 1]
2. 1 + cos5x = 1
cos5x = 0
5x = π/2 + πn, n ∈ Z
x = π/10 + πn/5, n ∈ Z
3. cos(x - π/3) = 1
x - π/3 = 2πn, n ∈ Z
x = π/3 + 2πn, n ∈ Z.
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Answers & Comments
Verified answer
1. cosx = -3 - не имеет решения, т.к. косинус аргумента принадлежит отрезку [-1; 1]2. 1 + cos5x = 1
cos5x = 0
5x = π/2 + πn, n ∈ Z
x = π/10 + πn/5, n ∈ Z
3. cos(x - π/3) = 1
x - π/3 = 2πn, n ∈ Z
x = π/3 + 2πn, n ∈ Z.