What are the reagents needed to form the specified product?
1. Hydroboration/ oxidation of the alkene. Expected trans product.
2. Substitution of the alcolhol with Bromide using PBr3 - probably via a Sn2 type displacement .
The third step is less certain, especially in terms of it taking place with reasonable yield. This could be a reaction with Lithium in Pentane (not pentene) or some ...
This three step solution is 215 words.