Prove $\frac { \sin ( x + y ) } { \sin x \sin y } = \cot x + \cot y$

question 99

Essay

Prove $\frac { \sin ( x + y ) } { \sin x \sin y } = \cot x + \cot y$ .

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Definitions:

Vietnam War

A prolonged conflict (1955-1975) between Communist forces in North Vietnam and non-Communist forces in South Vietnam, involving extensive U.S. military intervention.

Beacon Of Liberty

A symbol or guiding principle representing freedom and enlightenment.

Watchword

A word or phrase expressing a person's or group's core aim or principle; often used as a slogan or motto.

Vietnam Syndrome

The belief that the United States should be extremely cautious in deploying its military forces overseas that emerged after the end of the Vietnam War.