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kissylia12
@kissylia12
July 2022
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Помогите решить неравенство
2cos2x<0
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anmih
Verified answer
2 сos 2x < 0
cos 2x <0
π / 2 +2πn <
2x
<3π/2 + 2πn, n∈Z
π/4 + 2πn <
x
< 3π/4 + 2πn, n∈Z
3 votes
Thanks 1
kissylia12
Спасибо) А можно подробное решение?)
anmih
Куда уж подробнее? !
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Answers & Comments
Verified answer
2 сos 2x < 0cos 2x <0
π / 2 +2πn < 2x <3π/2 + 2πn, n∈Z
π/4 + 2πn < x < 3π/4 + 2πn, n∈Z