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quadcore
@quadcore
July 2022
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2cos4x-4sin([tex] \frac{ \pi }{2} [/tex]+2x)+3=0
Желательно подробно . Зарание спасибо.
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yarovoe
2cos4x-4sin(π/2 +2x)+3=0
Ясно,что sin(π/2+2x)=cos2x,тогда имеем:2cos4x-4cos2x+3=0.
Т.к.cos4x= cos²2x-sin²2x,то получаем:cos²2x-sin²2x=cos²2x-(1-cos²2х)=
cos²2x-1+ cos²2x= 2cos²2x-1 или:
4cos²2x-2-4cos2x+3=0. 4cos²2x-4cos2x+0
(2cos2x-1)²=0,2cos2x=1,cos2x=0,5,2x=+-(π/3)+2πn,x=+-(π/6)+πn,n∈Z
Ответ:x=+-(π/6)+πn,n∈Z
2 votes
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Answers & Comments
Ясно,что sin(π/2+2x)=cos2x,тогда имеем:2cos4x-4cos2x+3=0.
Т.к.cos4x= cos²2x-sin²2x,то получаем:cos²2x-sin²2x=cos²2x-(1-cos²2х)=
cos²2x-1+ cos²2x= 2cos²2x-1 или:
4cos²2x-2-4cos2x+3=0. 4cos²2x-4cos2x+0
(2cos2x-1)²=0,2cos2x=1,cos2x=0,5,2x=+-(π/3)+2πn,x=+-(π/6)+πn,n∈Z
Ответ:x=+-(π/6)+πn,n∈Z