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() ()
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2
t
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() ()
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i
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2
i
1
sin
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2
1
2
1
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()
∫∫
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0
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sinicos
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ω
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π
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π
d
t
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∫
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=
11
11
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1
n
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i
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22
tt
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ii
22
1
2
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a
a
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t
f ttted
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t
tt
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1
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1
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t
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tt
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222
π
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5
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et
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