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Question

If f(2a − x) = −f(x), prove that 02afx dx=0.

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Solution

Let I=02afxdxUsing additive propertyI=0afxdx+a2afxdxConsider the integral a2afxdxLet x=2a-t, Then dx=-dtWhen x=a, t=a and x=2a, t=0Therefore,a2afxdx=-a0f2a-tdt =0af2a-tdt =0af2a-xdx changing the variableWe have f2a-x=-fxTherefore,I=0afxdx-0afxdx =0

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