rozwiążcie sin alfa = 5/13
a-alfa
sin^2a+cos^a=1
25/169+cos^a=1
cos^2a=1-25/169
cos^2a=144/169
cosa=12/13
tga=sina/cosa
tga=5/13/12/13
tga=5/13*13/12
tga=5/12
ctga=1/tga
ctga=1/5/12
ctga=12/5
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a-alfa
sin^2a+cos^a=1
25/169+cos^a=1
cos^2a=1-25/169
cos^2a=144/169
cosa=12/13
tga=sina/cosa
tga=5/13/12/13
tga=5/13*13/12
tga=5/12
ctga=1/tga
ctga=1/5/12
ctga=12/5