已知a的终边在射线y=2x(x>0)上,求角a的正弦.余弦和正切的值在在答案中有x²+y²=1.所以x=5分之根号5.y的5分之2倍根号5.这个怎么来的啊.还有一个.根号.里面有(24a)²+(-7a)²=25
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![已知a的终边在射线y=2x(x>0)上,求角a的正弦.余弦和正切的值在在答案中有x²+y²=1.所以x=5分之根号5.y的5分之2倍根号5.这个怎么来的啊.还有一个.根号.里面有(24a)²+(-7a)²=25](/uploads/image/z/10014043-67-3.jpg?t=%E5%B7%B2%E7%9F%A5a%E7%9A%84%E7%BB%88%E8%BE%B9%E5%9C%A8%E5%B0%84%E7%BA%BFy%3D2x%EF%BC%88x%EF%BC%9E0%EF%BC%89%E4%B8%8A%2C%E6%B1%82%E8%A7%92a%E7%9A%84%E6%AD%A3%E5%BC%A6.%E4%BD%99%E5%BC%A6%E5%92%8C%E6%AD%A3%E5%88%87%E7%9A%84%E5%80%BC%E5%9C%A8%E5%9C%A8%E7%AD%94%E6%A1%88%E4%B8%AD%E6%9C%89x%26%23178%3B%2By%26%23178%3B%3D1.%E6%89%80%E4%BB%A5x%3D5%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B75.y%E7%9A%845%E5%88%86%E4%B9%8B2%E5%80%8D%E6%A0%B9%E5%8F%B75.%E8%BF%99%E4%B8%AA%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84%E5%95%8A.%E8%BF%98%E6%9C%89%E4%B8%80%E4%B8%AA.%E6%A0%B9%E5%8F%B7.%E9%87%8C%E9%9D%A2%E6%9C%89%EF%BC%8824a%EF%BC%89%26%23178%3B%2B%EF%BC%88-7a%EF%BC%89%26%23178%3B%3D25)
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