what is a in https://webwork.math.su.se/webwork2_...db79cef091.png?

tips what i shall do, i cant get any ide atm

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- Sep 18th 2012, 10:05 AMPetrus:)
what is a in https://webwork.math.su.se/webwork2_...db79cef091.png?

tips what i shall do, i cant get any ide atm - Sep 18th 2012, 10:19 AMPlatoRe: :)