Harry, peter and 7 girls sit in a row. harry can't sit in an end seat. in how many ways can they be arranged?

List of all possibilities, without restrictions (ie Harry can sit in any of the 9 seats):
List of all possibilities where Harry sits on either end:

Hence, list of all possibilities where Harry doesn't sit on either end: ways.

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)