# Homework Help: Find the Integer N, solution attached

1. Jun 18, 2014

### chassiz

1. The problem statement, all variables and given/known data

The expression sin(2°) sin(4°) sin(6°)... sin(90°) is equal to a number of the form (n√5)/2^50
where "n" is an integer. Find n

2. Relevant equations

geometric sum: a/ 1-r

3. The attempt at a solution

I found the solution online but have no idea how they got it... been going back and forth trying to figure it out on my own but I don't understand. Any help would be appreciated everyone. Thanks!
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### solution 7.jpg
File size:
59.6 KB
Views:
108
2. Jun 18, 2014

### Simon Bridge

Never mind the online solution
How would you go about finding the answer?
You need to be able to use the geometric sum stuff - so you need to be able to change the product of sines into a sum of something - there are not many different ways to do this.