You just multiply top times top and bottom times bottom and then find a number you can divide into the number and you keep doing that until you can't simplify any more.
common difference=d=43-39=4
We need first term a
Answer: sec (x)
Step-by-step explanation: sin (2x). cos(2x)
_______ -- __________
sin(x). cos(x)
The answer is as follows...i tried to post this on the other question you asked but it didnt attach so i apologise