The same thing that cosine means in trigonometry, a calculator just allows you to calculate such functions quickly.
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It is cosine*cosine*cosine.
Input is when you type with the calculator
"COS" stands for "Cosine", which is one of the 6 trigonometric functions. Similarly, "SIN" stands for Sine, and TAN stands for Tangent.
The cosine of 60 degrees is 0.5
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