论文部分内容阅读
题目已知25cosA+5sinB+tanC=0,且sin2B-4cosA·tanC=0, 求证:tanC=25cosA. 分析仔细观察题目,发现它与一元二次方程的联系,即得证法.
The topic is known as 25cosA+5sinB+tanC=0, and sin2B-4cosA·tanC=0. Proof: tanC=25cosA. Analyze the subject carefully and find that it is related to the one-dimensional quadratic equation, ie, the method of verification.