“plus or minus”的概念、定义、翻译、参考文献-科学参考

单词	plus or minus
释义	plus or minus Mathematics The symbol ± is read as ‘plus or minus’ and denotes the two possibilities of + and−as in the the quadratic formula, when either the positive or negative square root of the discriminant is valid. It can be efficiently used alongside the ∓ symbol, read ‘minus or plus’, as in the identity $cos (x \pm y) = cos x cos y \mp sin x sin y,$ to signify that the + (respectively − ) in ± corresponds to the − (respectively + ) in ∓.
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