1 1 1
---------------------- = ------------------------- = -------------------------------- =
tg(α)+ctg(α) sin(α) cos(α) sin²(α) +cos²(α)
---------- + -------------- -------------------------
cos(α) sin(α) cos(α)*sin(α)
cos(α)*sin(α) cos(α)*sin(α)
= -------------------------------- = --------------------- = cos(α)*sin(α)
sin²(α) +cos²(α) 1