[tex]ctg(2arcsin (1/\sqrt{2} ))=ctg(2arcsin \frac{\sqrt{2} }{2} )=ctg(2*\frac{\pi }{4} } )=ctg(\frac{ \pi }{2} )=0[/tex]
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[tex]ctg(2arcsin (1/\sqrt{2} ))=ctg(2arcsin \frac{\sqrt{2} }{2} )=ctg(2*\frac{\pi }{4} } )=ctg(\frac{ \pi }{2} )=0[/tex]