Is there a legend online where I can lookup where each of those trig functions are between? like how sin is between -pi/2 and pi/2 but for all of them?
incomprehensible to me.
There is a mnemonic to remember which is positive in which quadrant.
All Silly Tom Cats, meaning sin, cos and tan are positive in the first quadrant,
sin only in the second, tan only in the third and cos only in the fourth.