Cos4x - cos6x +sin5x = 0

Question

Cos4x - cos6x +sin5x = 0

Comments

В Архив

Answer 1

Смотри решение во вложении

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Answer 2

2sinxsin5x+sin5x=0
sin5x(2sinx+1)=0
sin5x=0⇒5x=πn⇒x=πn/5
sinx=-1/2⇒x=(-1)^n+1 *π/6+πn