Simplify  1+cosy / 1-cosy   This uses trig identities from chapter 7 and I can not figure out how to simplify this.

PREALGEBRA
15th Edition
ISBN:9781938168994
Author:OpenStax
Publisher:OpenStax
Chapter3: Integers
Section3.1: Introduction To Integers
Problem 62E: What are the three uses of the “-” sign in algebra? Explain how they differ.
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Simplify  1+cosy / 1-cosy

 

This uses trig identities from chapter 7 and I can not figure out how to simplify this.

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