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