Answer:


Step-by-step explanation:
The trigonometric function;
has zeroes at
where
is an odd integer.
The trigonometric function;
. This also has zeroes at
where
is an odd integer.
So if you want it to be 9 less than your number (x) then you would subtract nine.
So it would be:
x - 9.
So if your "number" is 12 then you would substitute x for 12 and it would be 12-9. The answer is 3. So 3 is 9 less than a number (12).
I believe