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yuliyakornienk
@yuliyakornienk
July 2022
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1 решить уравнение 3х^2+х=9
2 найдите общий вид первообразных для функции F(X)= sinx - cosx
3 упростите выражение sinb\1+cosb + sinb\1-cosb
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Gerren
1) 3x^2+x-9=0
D=1+4*3*9=109
x1,2=(-1+-√109)/6
2) F(x)=cosx+sinx+C
3)
sinb\(1+cosb) + sinb\(1-cosb)= (sinb(1-cosb)+sinb(1+cosb)/(1+cosb)(1-cosb)=(sinb -sinbcosb+sinb+sinbcosb)/(1-(cosb)^2)=2sinb/(sinb)^2=2/sinb
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Thanks 1
yuliyakornienk
спасибо тебе большое
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Answers & Comments
D=1+4*3*9=109
x1,2=(-1+-√109)/6
2) F(x)=cosx+sinx+C
3)sinb\(1+cosb) + sinb\(1-cosb)= (sinb(1-cosb)+sinb(1+cosb)/(1+cosb)(1-cosb)=(sinb -sinbcosb+sinb+sinbcosb)/(1-(cosb)^2)=2sinb/(sinb)^2=2/sinb