=IF(((H190.75)*AND(H200.75)),(((B16/B17)+4.68*(B18/B19))/(33650/SQRT(B12))),"N/A")

This is my current equation for a cell. It says that if two specific cell
exced .75, then calcualte (((B16/B17)+4.68*(B18/B19))/(33650/SQRT(B12))), but
if false display N/A.

What i need it do is if (((B16/B17)+4.68*(B18/B19))/(33650/SQRT(B12)))1, i
need say "INVALID FOR LFD".

So if both cells don't exceed .75 i need it to say "N/A".
If the value is 1 or less i need it to give me value
And if it exceed's 1 i need the cell to say "INVALID FOR LFD"