সঠিক উত্তরটি নির্বাচন করো :
(x, - y) এবং (-x, y) বিন্দুদ্বয়ের মধ্যে দূরত্ব হবে -
(a) \(\sqrt {2 (x^2 + y^2)}\) (b) \(\sqrt{x^2 + y^2}\) (c) \(2 \sqrt{x^2 + y^2}\) (d) কোনোটিই নয়
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