What trig functions are positive in which quadrants?

1 Answer
Apr 4, 2016

All the trig functions are positive in Quadrant 1. Sine and cosecant are positive in Quadrant 2, tangent and cotangent are positive in Quadrant 3, and cosine and secant are positive in Quadrant 4.

Explanation:

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(From http://www.dummies.com/how-to/content/signs-of-trigonometry-functions-in-quadrants.html)

What always helps me is the acronym:
color(black)(A)dd - all functions positive in Q1
color(black)(S)ugar - sine positive in Q2
color(black)(T)o - tangent positive in Q3
color(black)(C)offee - cosine positive in Q4