E 746 sinαcosβ=1/2(sin(α+β)+sin(α-β)) cosαsinβ=1/2(sin(α+β)-sin(α-β)) cosαcosβ=1/2(sin(α+β)+cos(α-β)) sinαsinβ=1/2(cos(α+β)-cos(α-β)) 数学の記号を見ただけで、アレルギーを感じる人がいる。「数学の授業で習ったことは役に立ったことがない」という人もいる。しかし、数学は実は、社会の裏方として私たちの暮らしを支える、無くてはならない存在になりつつある。たとえばクレジットカードによる買い物は、数学の理論を使った「暗号」に守られている。 Some people get nerves when they just look mathematical symbols. Some say " what I had studied in math class have been useless." But mathematics is ,in fact, supporting our living while we are not notice it, becoming inevitable things for us. For example , a shopping with credit card is protected by mathematical logic which is cord. 正解 Some people feel uncomfortable at the mere sight of mathematical symbols.Others complain that the things they learned in math lessons have never been useful in their daily lives. But ,in fact ,mathematics is becoming indispensable in supporting our way of life from behind the scenes . For example , shopping with credit cards is made secure by " codes" based on mathematical theory.
Posted on: Mon, 29 Jul 2013 11:20:37 +0000
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