[Urgent] Physics unit 1 edexcel range and time of flight

My exam is tomorrow and I have this doubt. There are two formulas. One for range and one for TOF
Range = (u²sin2θ)/g
TOF = (2usinθ)/g

But I don't see these used in mark schemes but, when I use them I get the correct answer. Is it alright to use these formulas? While I gain full marks?

My exam is tomorrow and I have this doubt. There are two formulas. One for range and one for TOF
Range = (u²sin2θ)/g
TOF = (2usinθ)/g

But I don't see these used in mark schemes but, when I use them I get the correct answer. Is it alright to use these formulas? While I gain full marks?

I would stick to standard suvat for several reasons:

1. Those results will only hold for the specific condition used in their derivation, i.e. the height it returns to must be the same so if the question was slightly different and this isn't true they do not hold.

2. You are unlikely to get/ there is the possibility that you will miss out on some working marks as they skip a lot of the intermediate steps.

By all means use them as a useful check, but I would advise you to do the question properly as well