Hi friends,

They give Cosx =2/3.....determine 1+tan^2x

I understand all of this, except the quadrant we are working in, since they give x is greater and equal to 0 deg and smaller and equal to 360 deg... Please help me understand this... Thank you kindly

juriemagic Oct 25, 2020

#1**+1 **

cos x = + 2/3 cosine is positive in Q I and Q IV .... or from 0 -90 and 270 = 360^{o}

ElectricPavlov Oct 25, 2020

#2**0 **

Hi ElectricPavlov,

yes, I know all this, my question really was about the fact that we are now working in 2 quadrants, when we USUALLY work in just one quadrant. I meant to say I did not, and still not really, understand why the question is formulated such that we are to work in 2 quadrants?

juriemagic
Oct 27, 2020