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一、问题的提出已知含特殊角的直角三角形的边角关系,我们就能够表示出这些特殊角的三角函数值.如求30°角的三角函数值.可构造如图1所示的直角三角形进行计
First, the problem raised Given the right angle with a special corner of the triangular triangle, we can express the trigonometric values of these special angles, such as seeking the trigonometric value of 30 ° angle can be constructed as shown in Figure 1 Right Angle Triangle calculation