**cosine cos **

The trig function cosine, which is written cos θ. For acute angles, cos θ can be found by the SOHCAHTOA definition, shown below on the left. The circle definition, a generalization of SOHCAHTOA, is shown below on the right. *f*(*x*) = cos *x* is a periodic function with period 2π.

**See also**

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