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CucumberR
@CucumberR
July 2022
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Решите уравнение:
sin^2 x/2 = cos^2 7x/2
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nig21
Sin^2 x/2 = cos^2 7x/2
(1-cosx)/2=(1+cos7x)/2
(1-cosx)/2-(1+cos7x)/2=0|*2
1-cosx-1-cos7x=0
cosx+cos7x=0
2cos4x*cos3x=0
2cos4x=0 и cos3x=0
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Answers & Comments
(1-cosx)/2=(1+cos7x)/2
(1-cosx)/2-(1+cos7x)/2=0|*2
1-cosx-1-cos7x=0
cosx+cos7x=0
2cos4x*cos3x=0
2cos4x=0 и cos3x=0