sin[tex]\alpha[/tex]=[tex]\frac{4}{5}[/tex]; [tex]\frac{\pi }{2}[/tex]<[tex]\alpha[/tex]<[tex]\pi[/tex] ; Знайти cos2[tex]\alpha[/tex], sin2[tex]\alpha[/tex],ctg2[tex]\alpha[/tex],tg2[tex]\alpha[/tex]
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