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Sonechka254
@Sonechka254
July 2021
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Помогите плииз решить!
голова ваще не варит:)
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sedinalana
1
f`(x)=1/(2x)
f`(1/4)=2
2
y=cos(4x-1)
y`=-4sin(4x-1)
y``=-16cos(4x-1)=-16y
3
x=0
f(0)=1
f`(x)=-1/2e^(-x/2)
f`(0)=-1/2
Y=1-1/2(x-0)=1-1/2*x
4
f`(x)=(2xe^x-2e^x)/4x²=2e^x*(x-2)/4x²=0
x-2=0
x=2
+ _
---------------(2)--------------------
возр (-∞;2)
убыв (2;∞)
5
S=S(4^x-2^x)dx=4^x/ln4-2^x/ln2|1-0=4/ln4-2/ln2-1/ln4+1/ln2=
=3/ln4-1/ln2=3/2ln2-1/ln2=(3-2)/2ln2=1/2ln2
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Answers & Comments
f`(x)=1/(2x)
f`(1/4)=2
2
y=cos(4x-1)
y`=-4sin(4x-1)
y``=-16cos(4x-1)=-16y
3
x=0
f(0)=1
f`(x)=-1/2e^(-x/2)
f`(0)=-1/2
Y=1-1/2(x-0)=1-1/2*x
4
f`(x)=(2xe^x-2e^x)/4x²=2e^x*(x-2)/4x²=0
x-2=0
x=2
+ _
---------------(2)--------------------
возр (-∞;2)
убыв (2;∞)
5
S=S(4^x-2^x)dx=4^x/ln4-2^x/ln2|1-0=4/ln4-2/ln2-1/ln4+1/ln2=
=3/ln4-1/ln2=3/2ln2-1/ln2=(3-2)/2ln2=1/2ln2