| cosine |
|
| 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.
by http://www.mathwords.com |
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