8
10
8
10
10
12
; 06-29-2015 08:24 PM
=1/2 *
=1/2 * *
=1
=2 =2 =-2 =0 =90 =2 =2
=2^2
13
8- 20
2= /
=-20 ^-2 =0 =90
2 =20*1=20
: 1 (0 1 )
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