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98q
@98q
August 2021
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Найдите корни уравнения, принадлежащие промежутку [-π;π). Уравнение уже решено: КАК НАЙТИ КОРНИ ИМЕННО ЭТОГО ПРОМЕЖУТКА?
cos(4x+π/4)=-корень из 2/2
4x+π/4=±(π-π/4)+2πn,n∈ℤ
4x=±3π/4-π/4+2πn,n∈ℤ
x=±3π/16-π/16+πn2,n∈ℤ
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