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kikirk
@kikirk
July 2022
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5
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cos5x = cos7x
sin3x - sin 2 x = (корень из 3) sin 7x
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Answers & Comments
kamron971
Cos5x=cos7x
cos5x-cos7x=0
-2sin(5x+7x/2)cos(5x-7x/2)=0
-2sin6xcosx=0
sin6x=0. cosx=0
6x=πn. x=π/2+π n
x=π/6 n
n€Z
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Answers & Comments
cos5x-cos7x=0
-2sin(5x+7x/2)cos(5x-7x/2)=0
-2sin6xcosx=0
sin6x=0. cosx=0
6x=πn. x=π/2+π n
x=π/6 n
n€Z