Question about Articles in S. L. Looney book "Plane Trig

Trigonometry equalities, inequalities and expressions - sin, cos, tan, cot

Question about Articles in S. L. Looney book "Plane Trig

Postby KarimTef » Wed Jul 20, 2016 6:05 pm

S. L. Looney in his book "Plane geometry", when he writes a formula, he notes next to it it's Article number. Example:

In page 11: cos (A + B) = cos A cos B - sin A sin B (Art. 88)

What are these articles? If they are gathered in a free downloadable document, I would like to have it.

Thank you.
KarimTef
 
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Re: Question about Articles in S. L. Looney book "Plane Trig

Postby Guest » Fri Jul 22, 2016 3:08 am

It simply refers to a later (or earlier) section of the same book. If you go to the section labelled 88 in the book he gives a proof of the formula.

Hope this helped,

R. Baber.
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Re: Question about Articles in S. L. Looney book "Plane Trig

Postby KarimTef » Fri Jul 22, 2016 6:13 am

@Baber: Thank you very much.

KarimTef
 
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