TRIG Sign of Sine Cosine Tangent
+ve
-ve
+ve
-ve
sin(x)
+ve
-ve
+ve
-ve
+ve
-ve
+ve
-ve
cos(x)
+ve
-ve
+ve
-ve
+ve
-ve
+ve
-ve
tan(x)
+ve
-ve
+ve
-ve
+ve
+ve
+ve
+ve
180° < x < 270°
270° < x < 360°
90° < x < 180°
sin(x)
0 < x < 90°
-ve
-ve
-ve
-ve
+ve
+ve
+ve
+ve
180° < x < 270°
270° < x < 360°
90° < x < 180°
cos(x)
0 < x < 90°
-ve
-ve
-ve
-ve
+ve
+ve
+ve
+ve
180° < x < 270°
270° < x < 360°
90° < x < 180°
tan(x)
0 < x < 90°
-ve
-ve
-ve
-ve
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