Signs and Ranges

Our six trig functions have different signs depending on their location on the coordinate plane. In quadrant I, all trig functions are positive. In Quadrant II, only sine and cosecant are positive. In Quandrant III, only tangent and cotangent are positive. And in Quadrant IV, only cosine and secant are positive. This holds true for all triangles that we can draw on a coordinate plane, and will come into greater effect later on in the year.