Solving Quadrantal triangles in spherical trigonometry using Napier's Rules

Spherical triangles with a 90 degree side are known as spherical triangle. They can be solved using Napier's rules just like the right-angled spherical triangles. But there is an exception.
Find out what is it and how to solve an example of a quadrantal triangle.
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Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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