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.^{[1]} 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 yaxis. 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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