Learning Guide Learning Guide

2.6 Expression Manipulation • 39> nops(x + y + z);3The op command allows you to access the parts of an expression. Itreturns the parts as a sequence.> op(x^2);x, 2You can also specify items by number or range.> op(1, x^2);x> op(2, x^2);2> op(2..-2, x+y+z+w);y, zCommon Questions about Expression ManipulationHow do I Substitute for a Product of Two Unknowns Use side relationsto specify an identity. Substituting directly does not usually work,since Maple searches for an exact match before substituting.> expr := a^3*b^2;expr := a 3 b 2> subs(a*b=5, expr);a 3 b 2The subs command was unsuccessful in its attempt to substitute. Trythe simplify command this time to get the desired answer.