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求三角函数的值域(最值)是高考的一大热点,也是一大难点。求值域可利用正弦、余弦函数的有界性,可借助一元二次函数,亦可用数形结合法。
Find the value of the trigonometric function (maximum) is a major hot college entrance examination, but also a major difficulty. The evaluation domain can take advantage of the boundedness of sine and cosine functions.