Cosθ<0, sinθ<0. In which quadrant does terminal side of θ lie?

1 Answer
Apr 17, 2018

#thetainQ_3#

Explanation:

it is clearly given that #costheta<0rArrcostheta=-ve# and #costheta=-ve in Q_2 and Q_3#
since #sintheta<0rArrsintheta=-ve# and #sintheta=-ve in Q_3 and Q_4# common quadrant where both #sintheta and costheta# are # -ve# is #Q_3#
hence #theta in Q_3#