Mistake Master
Mistake Master · AP Precalculus · Unit 3 · Step-Through Animation
One Point Carries All Three Values
You'll learnto read cosine, sine and tangent off one point on the unit circle.
Draw an angle from the positive x-axis and its ray crosses the unit circle at exactly one point. That one point carries the cosine, the sine and the tangent, all three, with nothing to memorise. Twelve short steps; press Next for each one.
one point on the circle carries all three values
Before you start
What you're looking at
A circle of radius 1 with an angle drawn from the positive x-axis.
The question
What can the one point where the ray crosses the circle tell you?