In right triangle trigonometry, the Cosine is defined to be equal to the length of the side adjacent to the angle divided by the length of the hypotenuse. In manipulative 1, click on the blue points and drag them to change the figure.
On the unit circle, cosine is the directed distance of a point on the unit circle from the y-axis. Click on the blue point in manipulative 1 and drag it to change the figure.
The inverse of the cosine function is the arccosine function. The arccosine function can be written as or .
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