WACC formula

Hello Mr Moffat.
Thank you very much for your great lectures.

Sorry to take your time sir, I am confused about the WACC formula.
There are TWO formulas for WACC.

Formula 1: WACC = Ve * Ke /(Ve+Vd) + Vd * Kd(1-t) /(Ve+Vd)

Formula 2: WACC = Veu(1 – Vdt/(Ve+Vd))

I am confused when I should use them. So far I though they both would lead to the same WACC, but it seems they are not the same. I mean there was a question which use the second formula to calculate the WACC, but when I tried to calculate the WACC with the first one the answer was not the same 🙁

Thanks