rezta zadania w załączniku.
tg=3
ctg=1/tg=1/3
-----------------------
tg=sin/cos
sin=tg*cos
sin=3cos
------------
sin^2+cos^2=1
(3cos)^2+cos^2=1
9cos^2+cos^2=1
10cos^2=1 /:10
cos^2=1/10
cos=1/v10
cos=v10/10
---------------
sin=3*v10/10
-----------------
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tg=3
ctg=1/tg=1/3
-----------------------
tg=sin/cos
sin=tg*cos
sin=3cos
------------
sin^2+cos^2=1
(3cos)^2+cos^2=1
9cos^2+cos^2=1
10cos^2=1 /:10
cos^2=1/10
cos=1/v10
cos=v10/10
---------------
sin=3cos
sin=3*v10/10
-----------------