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2²+b²=3²
b²=5
b=√5
tgα=2/√5 * √5/√5
tgα=2√5/5
1-4/9=5/9
cos²l=5/9
cosl=√5/3
sinl/cosl=tgl
2/3/√5/3=2/3x3/√5
=2/√5= po usunieciu niewymierności 2√5/5