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Rorieli
@Rorieli
August 2022
1
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объясните пожалуйста как получить из этого
[tex] \sin4x - \sin( \frac{\pi}{2} - 6x ) = 0[/tex]
вот это
[tex]2 \sin(5x - \frac{\pi}{4} ) \cos( \frac{\pi}{4} - x ) = 0[/tex]
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Answers & Comments
армения20171
Sin4x-sin(π/2-6x)=2*sin(4x-(π/2-6x))/2
*cos(4x+π/2-6x)/2=
2*sin(4x-π/2+6x)/2*cos((π/2-2x)/2=
2*sin(10x/2-π/2:2)*cos(π/2:2-2x:2)=
2*sin(5x-π/4)*cos(π/4-x)
1 votes
Thanks 1
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Answers & Comments
*cos(4x+π/2-6x)/2=
2*sin(4x-π/2+6x)/2*cos((π/2-2x)/2=
2*sin(10x/2-π/2:2)*cos(π/2:2-2x:2)=
2*sin(5x-π/4)*cos(π/4-x)