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math: pythagorean identity is wrong

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eggy 2020-12-09 10:58:50 -05:00
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@ -18,7 +18,7 @@ $$A=\frac{r^2\theta}{2}$$
### Trigonometric identities
The **Pythagorean identity** relates the radius of a circle to its x and y components.
$$\sin^2\theta+\cos^2\theta=\tan^2\theta$$
$$\sin^2\theta+\cos^2\theta=1$$
The **quotient identity** relates the side lengths of a right-angled triangle.
$$\tan\theta=\frac{\sin\theta}{\cos\theta}$$