sin 7x – sin x = cos 4х. Created by anfisasx28. matematika-ru

sin 7x – sin x = cos 4х...

July 2022 1 4 Report

sin 7x – sin x = cos 4х

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youngl3k 3)sin7x-sinx=cos4x
2sin((7x-x)/2)*cos(7x+x)/2)=cos4x
2sin3x*cos4x=cos4x
2sin3x=1
sin3x=1/2
3x=(-1)^k*p/6+pk
x=(-1)^k*p/18+pk/3; k принадлежит Z
или
cos4x=0
4x=p/2+pk

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