Thank you Fred. It makes sense that rearranging the formula I could get the result assign to the variable and use that in other formulas. But is there a way for Mathcad to rearrange that for me and use that figure linked to other formulas?
This equation is quite simple, but if we imagine having very complex one, we wouldn't want to rearrange the formula manually as we have a software for that.
Werner has shown you how to do what you wanted. (Since I am constrained to Prime Express, where symbolics are not possible, I had to resort to high school algebra.)
I am surprised that Werner didn't extrapolate his solution one more step: You can assign a function to the symbolic expression. Instead of just Cinput, put Cinput(fco,Lin) on the left hand side (put the whole symbolic line ABOVE where you define what the frequency and inductance values are.) Now you can solve for the capacitor value that satisfies any combination of frequency and inductance.
