So the question ask to find how to integrate cos2t without using substitution and base on my research, the integral of the cos2t = (1/2) sin(2t), and negate the said integral because the derivative of cosx is - sinx. I hope you are satisfied with my answer and feel free to ask for more
The answer Is 7
-hope this helped-
Please explain a little more what the question is so that I can help you !!
Answer:
42+7xy=(7*6)+(7xy).......
GIVEN: y(x−1)=zy(x−1)=z
Divide both sides by y to get: x−1=zyx−1=zy
Add 1 to both sides to get: x=zy+1