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Pw.mac is an enhancement to Maxima, so you will have to get Maxima. Pw.mac enables Maxima to handle integration, differentiation, computation of products, sums and powers, plotting, transforming and simplifying piecewise continuous functions.
Convert from abs() to iif()
Integrate iif() twice
Fourier Series
abs(a*x+b) and integrate(abs(a*x+b),x)