# HSF-TF.C.8

Prove the Pythagorean identity $\sin^2(\theta) + \cos^2(\theta) = 1$ and use it to find $\sin(\theta)$, $\cos(\theta)$, or $\tan(\theta)$ given $\sin(\theta)$, $\cos(\theta)$, or $\tan(\theta)$ and the quadrant of the angle.

## Tasks

Trigonometric Ratios and the Pythagorean Theorem

Finding Trig Values

Calculations with sine and cosine