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我们知道特殊角30°,45°,60°的三角函数值.15°也是一个比较特殊的角,怎样去求呢?本文以求正弦函数值为例来说明如何运用几何的方法求出15°的三角函数值.
We know that the trigonometric function values of special angles 30°, 45° and 60° are also special angles. How to solve this problem? This paper uses sine function values as an example to illustrate how to use geometrical methods to find 15°. The value of the trigonometric function.