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dianasporykhina
@dianasporykhina
July 2022
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cos9xcos7x - sin9xsin7x = - 1/2
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sacamota
CosA*cosB-sinA*sinB=cos(A+B)
поэтому:
cos(9x+7x)=-1/2
cos16x=-1/2
16x=2pi/3 или 16x=4pi/3
x=pi/24 или x=pi/12
3 votes
Thanks 6
dianasporykhina
Спасибо огромное.
sacamota
нез
sacamota
ты нажми спасибо
sacamota
и отцени
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Answers & Comments
поэтому:
cos(9x+7x)=-1/2
cos16x=-1/2
16x=2pi/3 или 16x=4pi/3
x=pi/24 или x=pi/12