Cosine Definition (Illustrated Mathematics Dictionary) Definition of Cosine more In a right angled triangle, the cosine of an angle is: The length of the adjacent side divided by the length

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For those comfortable in Math Speak, the domain and range of cosine is as follows. Domain of Cosine = all real numbers Range of Cosine = {-1 ≤ y ≤ 1} The cosine of an angle has a range of values from -1 to 1 inclusive. Below is a table

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