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Stiya
@Stiya
July 2022
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довести тождество
sin (П/4+x)+ cos (П/4+x)= √2 cos x
Распишите подробно пожалуйста, пытаюсь понять как сделать
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sedinalana
Verified answer
Sin(π/4+x)+cos(π/4+x)=sinπ/4*cosx+cosπ/4*sinx+cosπ/4*cosx-sinπ/4*sinx=
=√2/2*cosx+√2/2*sinx+√2/2*cosx-√2/2*sinx=√2cosx
√2cosx=√2cosx
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Answers & Comments
Verified answer
Sin(π/4+x)+cos(π/4+x)=sinπ/4*cosx+cosπ/4*sinx+cosπ/4*cosx-sinπ/4*sinx==√2/2*cosx+√2/2*sinx+√2/2*cosx-√2/2*sinx=√2cosx
√2cosx=√2cosx