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本文通过对两向量的向量积、数量积的大小关系的运算,利用单位圆对两角差的正弦、余弦公式进行证明,以提高教学效率,增强学生的创新思维意识.
In this paper, through the operation of the relationship between the magnitude and the volume of vector product and quantity product of two vectors, this paper uses the sine and cosine formulas of unit circle and two corners difference to prove, so as to improve teaching efficiency and enhance students’ innovative thinking.