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sin(x)=3/5
sin^2(x) = 1 - cos^2(x)
9/25 =1-cos^2(x)
cos^2(x)=16/25
cos(x)=4/5
tg(x)=(3/5)/(4/5)=3/4
ctg(x)=1/tg(x)=4/3
2.) analogicznie