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解高考三角题时,如果选择方法适当巧妙,可使复杂问题转化为简单问题,以至收到事半功倍的效果.下面介绍一些常用技巧与方法. 一、代数替换在三角函数问题中,若sinx±cosx与sinxcosx同时出现,可设t=sinx±cosx,把问题转化成关于t的二次函数,避开三角式讨论的麻烦.
When solving the college entrance examination trigonometric question, if the selection method is appropriate and ingenious, it can turn complex problems into simple problems and even receive more effective results. Here are some common techniques and methods. First, algebraic replacement in the trigonometric function problem, if sinx±cosx Simultaneously with sinxcosx, t = sinx + cosx can be set, transforming the problem into a quadratic function on t, avoiding the trouble of triangular discussion.