why f:D_{1 }→ R and g:D_2→ R real functions on summing, f+g:D_1∩ – InterviewSolution

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1.	why f:D_{1 }→ R and g:D_2→ R real functions on summing, f+g:D_1∩ D_{2 }→ R gives f(x)+g(x)?how
Answer» why f:D_{1 }→ R and g:D_2→ R real functions on summing, f+g:D_1∩ D_{2 }→ R gives f(x)+g(x)?how

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