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今年的高考数学卷中出现了一些关于三角函数中给值求值问题。这类问题解答的关键在于利用数学中化归思想探究已知角或整体之间的关系,认真考虑角的整体运用,分析已知角与未知角或特殊角如π2和π之间关系,再决定如何利用已知条件。恰当运用拆角及拼角等技巧,设法用条件中角表示待求问题中的角,避免盲目处理相关角的三角函数式,以免造成解题不必要的麻烦。
This year’s college entrance examination mathematics volume appeared in the trigonometric function to the value of the problem. The key to answering this kind of question lies in exploring the relationship between the known angle and whole body by using the idea of returning to mathematics, considering the overall application of angle, analyzing the relationship between known angle and unknown angle or special angle such as π2 and π Decide how to use known conditions. Appropriate use of skills such as the removal of the angle and the fight angle, trying to use the condition of the angle of the corner to be asked to solve the problem, to avoid blindly dealing with the trigonometric function of the angle, so as to avoid unnecessary trouble solving problems.