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Re: Cosine formula to solve a right spherical triangle?
From: Alexandre Eremenko
Date: 2020 Jan 21, 20:06 +0000

Cosine formula has one drawback: when you want to determine an angle or a side from its cosine,
and this angle or side is small, the error is magnified.

The reason is that when the angle is close to zero, cosine varies very little, so small errors in cosine
can lead to big errors in the angle.

Alex.
________________________________________
From: NavList@fer3.com [NavList@fer3.com] on behalf of Rajeev Yadav [NoReply_RajeevYadav@fer3.com]
Sent: Tuesday, January 21, 2020 1:01 PM
To: eremenko@math.purdue.edu
Subject: [NavList] Cosine formula to solve a right spherical triangle?

Can Cosine rule be used to solve a right angled triangle . this is with 
reference to Napiers Analogies, and is it possible to use Cosine formula 
instead of the Napiers rules .

Thanks

Rajeev

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