Rewrite the expression as a sum or difference, then simplify if possible.

the expression    as a sum or difference is   and , is simplified as   .

Step-by-step explanation:

We need to rewrite the expression as a sum or difference , them simplify if possible  , And the expression is :

From trigonometric identity we know that

Using the above identity we get:

⇒  

⇒  

⇒  

⇒  

⇒  

Therefore , the expression    as a sum or difference is   and , is simplified as   .

the one on the bottom left

step-by-step explanation:

all of the other ones have a specific pattern

step-by-step explanation:

(s)he  is right it would be 5.5% because it is smaller than 15.5% or anything smaller than 15.5% in general