sin7xsin9x-sin2xsin4x=0Помогите ребята!. Created by Аленаяпак. algebra-ru

sin7xsin9x-sin2xsin4x=0Помогите ребята!...

Аленаяпак @Аленаяпак

July 2022 1 0 Report

sin7xsin9x-sin2xsin4x=0
Помогите ребята!

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sedinalana

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1/2cos2x-1/2cos16x-1/2cos2x+1/2cos6x=0
1/2cos6x-1/2cos16x=0
1/2(cos6x-cos16)=0
1/2*2sin5xsin11x=0
sin5x=0⇒5x=πn⇒x=πn/5,n∈z
sin11x=0⇒11x=πn⇒x=πn/11,n∈z

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