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sin2α+cos2α=1是一个重要的三角公式,某些三角函数的化简与求值问题,若能根据题目特点恰当应用它,常能迅速打通思路,使问题巧妙获解.下面列举几例,供读者赏析.
Sin2α+cos2α=1 is an important trigonometric formula. The simplification and evaluation of some trigonometric functions can be quickly applied if they can be properly applied according to the characteristics of the topic. This will enable the problem to be solved cleverly. Here are some examples. For the reader to appreciate.