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can anyone show me how to do this question ? thanks ...

express (1+x^2)/((1+x)(1+2x)) in partial fraction. (this step i know the solution )

hence,find the constant term in the expansion if (1+x^2)/(-3x(1+x)(1+2x)) in ascending power of x .( then this one dont know ,please help me ) thanks .....

express (1+x^2)/((1+x)(1+2x)) in partial fraction. (this step i know the solution )

hence,find the constant term in the expansion if (1+x^2)/(-3x(1+x)(1+2x)) in ascending power of x .( then this one dont know ,please help me ) thanks .....

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