It means "next to" - as it does in all other areas of communication.
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If you mean cosine then it is angle ratio found in a right angle triangle which is adjacent/hypotenuse
its mean like well its a math term its like distrubed fractions
The word "mean" in math means the same thing as average. Mean is just a nickname for average.
in math terms reduce means to simplify
The word increased in a math problem means you are adding to terms or numbers.