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Calculați tg(π/2-arctg1/2)

Răspuns :

Salut,

[tex]tg\left(\dfrac{\pi}2-arctg\dfrac{1}2\right)=ctg\left(arctg\dfrac{1}2\right)=\dfrac{1}{tg\left(arctg\dfrac{1}2\right)}=\dfrac{1}{\dfrac{1}2}=2.[/tex]

Green eyes.