Hello, can somebody please explain the intermediate steps I take to solve the following?
Thanks!
First off, the can be pulled out. So we have . Take . Then we can rewrite the sum as . Now apply the formula for and simplify. From there, you should get the desired result.
First off, the can be pulled out. So we have . Take . Then we can rewrite the sum as . Now apply the formula for and simplify. From there, you should get the desired result.
Does this make sense?
Many thanks for your help. Sorry, which formula do I use for — almost there