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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