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1
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x
x
x +  a
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xx
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25
3
 a
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21
xx
x
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 a
2
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10ln210
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x
x

a
22
2
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x
xxxx
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 a
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1

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x
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b
a
a
x
x
b
b
a
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4
1
2
x
x
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xxx
xx
+ 
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2
xfx
′
 a xxke
kx
k
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2
1

=aa
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xx
x
 a
2
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x
xxx?

a
22
1
xa +
 a xcsc 
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2
4
2
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x
x
 a
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xx
e
x
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5=s?
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22
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1
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′
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′