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If int0^oo(sinx)/xdx=pi/2,t h e nint0^oo...

If `int_0^oo(sinx)/xdx=pi/2,t h e nint_0^oo(sin^3x)/x dx` is equal to (a)`pi/2` (b) `pi/4` (c) `pi/6` (d) `(3pi)/2`

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