Evaluate : $$(i) \int \: (x-3) \sqrt {x^2+4x+3} dx$$ $$(ii) \int \: (3x+5) \sqrt {2x^2+3x+7} dx$$ $$(iii) \int \: (x-4) \sqrt {4+x-x^2} dx$$ $$(iv) \int \: (5x-1) \sqrt {6+5x-2x^2} dx$$

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