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三角中有两句口诀:“奇变偶不变,符号看象限。”这个口诀在帮助学生掌握几十个诱导公式上起了不凡的作用。我们从这里将得到启发,试着用口诀来辅助教学。实践证明,这种作法,对于时间紧迫、任务繁
There are two formulas in the triangle: “The odd change does not change, symbols see quadrant.” This formula to help students master dozens of induction formula played an extraordinary role. We will be inspired from here, try to use formulas to assist teaching. Practice has proved that such an approach is time-intensive and complicated