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korzystamy z wzoru na jedynke trygonometryczna i obliczany cosα
sin²α+cosα²=1
1/16+cos²α=1
cos²α=15/16
cosα=√15/4
tgα=sinα/cosα
tgα=(1/4)/(√15/4)=1/√15=√15/15
3+2tg²α=3+2*(√15/15)²=3+2*(15/225)=3+(30/225)=705/225