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माना f ,g और h , R से R तक दिये गये फलन हैं । सिद्ध कीजिए कि :
(fg ) oh = (foh ) (goh ).

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`(f*g)oh(x) =(f*g)[h(x)]`
`=f[h(x)]*g(h(x)]`
`=(fog)(x)*(goh)(x)`
`=(foh)*(goh)(x)`
`=(foh)*(goh)(x)`
`therefore (f*g)oh=(foh)*(goh)` यही सिद्ध करना था ।

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