Odgovor:
#tan theta = -1 #
Pojasnilo:
# x + y = 0 #
# r * cos theta + r * sin theta = 0 #
#cos theta + sin theta = 0 #
#cos theta / cos theta + sin theta / cos theta = 0 / cos theta #
# 1 + tan theta = 0 #
#tan theta = -1 #
Bog blagoslovi …. Upam, da je razlaga koristna.