The document discusses the signs of trigonometric functions based on the quadrant of the angle θ. It states that all trig functions are positive in quadrant I, and have either a negative x-coordinate and positive y-coordinate (quadrant II), negative x and y coordinates (quadrant III), or positive x and negative y (quadrant IV). It also lists the sign relationships for the trig functions when θ is replaced with -θ.

1. Trigonometry
Signs of Trigonometric Functions
Presented to : Ma’am Munazza
Presented by : Faiza Afzal

2. Signs of Trigonometric Functions
 Signs of trigonometric functions can find if quadrant of θ
is known
 All trigonometric functions are positive in quadrant І.
 Trigonometric functions in quadrant ІІ have negative x-
coordinate and positive y-coordinate.
 Trigonometric functions in quadrant ІІІ have negative x-
coordinate and negative y-coordinate.

3. Continue…
 Trigonometric functions in quadrant ІV have positive x-
coordinate and negative y-coordinate.
sin (-θ) = -sin θ ; cosec (-θ) = -cosec θ
cos (-θ) = cos θ ; sec (-θ) = sec θ
tan (-θ) = -tan θ ; cot (-θ) = -cot θ