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Calculeaza Tg(pi/2-arctg 1/2)

Răspuns :

Incognito
[tex] \tan(\frac{\pi}{2}-x)=\cot x\\ x=\arctan\frac{1}{2} \\ \cot(\arctan(\frac{1}{2}))=\frac{1}{\tan{\arctan\frac{1}{2}}}=\frac{1}{\frac{1}{2}}=2[/tex]

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