cscx
(cscx + cotx)
2014 ... ...
(03-30-2014), (03-30-2014)
x cosx^-1
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(03-31-2014), (03-31-2014), (03-31-2014)
1 /18-x^2
18 x x 18
x
... ... ( + )...
(04-01-2014), (04-02-2014), (04-01-2014)
(( )) ٢ ( ) ( )2 () ... ...
: 1 (0 1 )
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