e c c o   g l i   e s e r c i z i :   
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 1            f ( x ) = a r c t g [ ( x + 1 ) ^ 0 . 5   - x ] 
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              #    1 / ( x ^ 2   *   ( x - 1 ) ^ 0 . 5   )               
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             !#    
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 4      l i m         { [ t a n ^ 2 ( x ) ] ^ 1 / 3 } / [ ( 1 + s i n x ) ^ 0 . 5   - 1 ] 
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         x !0 + 
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