PLEASE HELP (Again) Induction!!

Hi, i am clear on how to answer many questions on proof by induction, however i dont understand how to do this question! My lecturer has not explained it at all and i am so panicking!!!!

Calculate several first values of the products

n

**Π**

j=2

(1 −4/(2j − 1) ²) = (1 −4/3²)(1-4/5² )(1 −4/7²)・ ・ ・(1 −4/(2n − 1) ²)

and guess the general expression for it. Prove your guess by mathematical induction.

Nobody has to tell me the answer, but could please someone explain how to do it??

PLEASE!!!!!!!!