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education/math/MATH1060 (trig)/The Unit Circle.md
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@ -10,6 +10,9 @@ When sine is positive, the $y$ value is positive. When $x$ is positive, the cosi
$$ cos(\theta) = x $$ $$ cos(\theta) = x $$
$$ sin(\theta) = y $$ $$ sin(\theta) = y $$
## Sine and Cosine
| Angle | $0$
## The Pythagorean Identity ## 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. The Pythagorean identity expresses the Pythagorean theorem in terms of trigonometric functions. It's a basic relation between the sine and cosine functions.
$$ sin^2 \theta + cos^2 \theta = 1 $$ $$ sin^2 \theta + cos^2 \theta = 1 $$