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If f(x)=cosx-int0^x(x-t)f(t)dt ,t h e nf...

If `f(x)=cosx-int_0^x(x-t)f(t)dt ,t h e nf^(primeprime)(x)+f(x)` is equal to (a)`-cosx` (b) `-sinx` (c)`int_0^x(x-t)f(t)dt` (d) 0

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