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1 , , , ,
2
3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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18
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20
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21
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22
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23
, , .
.
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24 0
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25 π/2
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26 π
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27 3π/2
π/2 3π/2 , , ( ) .
π . 1 0 .
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28 π
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29 0