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cos=1/5
sin2+cos2=1
sin2+(1/5)2=1
sin2=1-1/25
sin2=24/25
sin=pierwiastek z 24/5
sin/cos=tg
(pierw.24/5)/1/5=pierw.24
1/tg=ctg
ctg=1/pierw.24
ctg=pierw.24/24