16in I believe irdk
Hope it helped..
If

then the derivative is

Critical points occur where
. This happens for



In the first case, we find

In the second,

So all the critical points occur at multiples of
, or
. (This includes all the even multiples of
.)
50 + (50 * 0.065) = the answer, sorry I don't have my calculator on me.
Answer:
the answer is

cause sin²x= 2/25
so cos²x would be 1-2/25= 23/25
then cos x is what I wrote as the answer