若实数x,y满足 x+y/1-xy=根号2,求 |1-xy|/(根号下1+x²)×(根号下1+y²)
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若实数x,y满足 x+y/1-xy=根号2,求 |1-xy|/(根号下1+x²)×(根号下1+y²) 思路是用三角函数解
![若实数x,y满足 x+y/1-xy=根号2,求 |1-xy|/(根号下1+x²)×(根号下1+y²)](/uploads/image/z/18874536-24-6.jpg?t=%E8%8B%A5%E5%AE%9E%E6%95%B0x%2Cy%E6%BB%A1%E8%B6%B3+x%2By%2F1-xy%3D%E6%A0%B9%E5%8F%B72%2C%E6%B1%82+%7C1-xy%7C%2F%EF%BC%88%E6%A0%B9%E5%8F%B7%E4%B8%8B1%2Bx%26%23178%3B%EF%BC%89%C3%97%EF%BC%88%E6%A0%B9%E5%8F%B7%E4%B8%8B1%2By%26%23178%3B%EF%BC%89)
x = tan(a),y = tan(b)
那么sqrt(2) = (x+y)/(1-xy) = (tana + tanb) / (1 - tana*tanb) = tan(a+b)
|1-xy|/...= |1-tana*tanb| / (|seca| * |secb|) = |1-tana*tanb| * |cosa| * |cosb|
= |cosa * cosb - sina * sinb| = |cos(a+b)| = 1/sqrt(1 + tan^2(a+b)) = 1/sqrt(3)
那么sqrt(2) = (x+y)/(1-xy) = (tana + tanb) / (1 - tana*tanb) = tan(a+b)
|1-xy|/...= |1-tana*tanb| / (|seca| * |secb|) = |1-tana*tanb| * |cosa| * |cosb|
= |cosa * cosb - sina * sinb| = |cos(a+b)| = 1/sqrt(1 + tan^2(a+b)) = 1/sqrt(3)
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