So you want to show that there exist points and , either or , such that .
I recommend starting by squaring both sides. You can then write the equation in terms of and . Obviously one solution will be and but there is another solution. Find it.
So you want to show that there exist points and , either or , such that .
I recommend starting by squaring both sides. You can then write the equation in terms of and . Obviously one solution will be and but there is another solution. Find it.