What trig functions are positive in which quadrants?

1 Answer
Ken C.
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

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