21. For a functionf, f(x + y) = f(x) + f(y), #x, y ER, then show that if the function is continuous at x = a, then it is continuous for a value of x E R. (फलन के लिए f(x+y) = f(x) + f(y), x, YER, तो प्रदर्शित करिये कि यदि फलन (बिन्दु x = a पर संतत है, तो यह प्रत्येक वास्तविक संख्या के लिए संतत होगा)
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XY ER FunctionY + 2021 forty
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