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education/math/MATH1060 (trig)/The Unit Circle.md

@@ -7,7 +7,12 @@ Sine and cosine can be used to find the coordinates of specific points on the un
 
 When sine is positive, the $y$ value is positive. When $x$ is positive, the cosine is positive.
 
-$$ cos\
+$$ cos(\theta) = x $$
+$$ sin(\theta) = y $$
+
+## The Pythagorean Identity
+The Pythagorean identity expresses the Pythagorean theorem in terms of trigonometric functions. It's a basic relation between the sine and cosine functions.
+$$ sin^2 \theta + cos^2 \theta = 1 $$
 
 # Definitions