Thanks. On Thursday, March 19, 2015 at 4:27:42 PM UTC+2, Francesco Bonazzi wrote: > > Try this one: > > cos(4*x+6).replace( > lambda expr: expr.is_Add, > lambda expr: ((expr/(2*x+3)).simplify()*u) > ) > > > > On Thursday, March 19, 2015 at 12:45:35 PM UTC+1, Paul Royik wrote: >> >> What is the best way to replace cos(4x+6) with cos(2u) if u=2x+3? >> >> cos(4x+6).subs(2x+3, u) doesn't work and I don't know how to write it >> using replace. >> >> I can' t do factor, since expression can be very big and factoring is not >> desirable. >> Is it possible to do it without factoring in clean way? >> >> >> Thank you. >> >
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