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一、从题目类型的角度解析三角函数(一)三角函数中的最值问题三角函数的最值问题是三角函数中的难点问题,遇到这样的问题通常会有以下几种解法:1.由于对于三角函数而言,他的值一般是有界限的,形如y=asinx+bsiny的函数,可以将其转化成y=Asin(ωx+y)+B的形式,然后可以求出其函数的边界值;2.有的时候还可以根据换元法,把三角函数换算成二次甚至是高次函数,然后结合等效变量值的取值范围,再求解出该函数的最大值与最小值;3.利用基本的不等式方法来求解其极值,不过这种情况一般都是求解其最小值。在这里可以举一个
First, the analysis from the perspective of the type of trigonometric functions (a) the maximum value of the trigonometric functions The most significant problem of trigonometric functions is the difficulty of the trigonometric functions encountered such problems usually have the following solutions: 1. Due to For a trigonometric function, his value is generally a bounded, shaped function as y = asin + bsiny, which can be transformed into a form of y = Asin (ωx + y) + B, Boundary value; 2. Sometimes also according to the metamorphosis method, the trigonometric function is converted into a second or even a higher order function, and then combined with the range of equivalent variable values, and then solve the maximum and minimum of the function ; 3. Solve its extremum using the basic inequality method, but in this case, it is generally to find its minimum value. Here can give one