The function
is defined as follows :
Basically, you are trying to simplify this :
,
It is equivalent to (by substituting the function into your expression) :
,
Expand this :
,
Further expansion required ...
,
Simplify :
> get rid of the constants (150, 130, 20, ...), they cancel out (who would have guessed it ?).
> simplify the linear coefficients (60h - 4h) !
> reorganize the equation, looks better ...
,
Factorize with
:
,
Finally, cancel out the
, to find :
And you are done
EDIT : ah Defunkt you win, I was busy checking my reply :/