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在三角函数学习中,化简三角函数式、求三角函数式的值、证明三角恒等式、证明条件等式和解三角不等式等类型习题,都需要对三角函数式进行变换,即对三角函数式进行恒等变形,它的理论依据除了运用代数恒等变形的一般方法和法则外,还具有它特殊的一面,即三角函数有两个变量一函数和角,可利用三角公式(或变形公式),变形中要注意三角函数的定义域和值域的要求,以及符号的变化和选择.怎样能提高“三角函数式恒等变形”的能力呢?
In trigonometric function learning, simplifying the trigonometric function, finding the value of the trigonometric function, proving the trigonometric identities, proving the conditional equations and solving the trigonometric inequalities and other types of exercises, all need to transform the trigonometric functions, that is, In addition to the general method and law of using algebraic constant deformation, its theoretical basis has its special aspect. That is, the trigonometric function has two variables, a function and angle. It can use trigonometric formula (or deformation formula), deformation Pay attention to the definition of trigonometric function domain and the value of the domain requirements, as well as changes and choices of symbols.How can we improve the “trigonometric function of the same type of deformation” ability?