Some formulae that might help:Originally Posted bympgc_ac

If

Then

And:

I tried, but the algebra is too much, there must be another way

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- May 10th 2006, 08:26 PM #1

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## Proof of NApier Analogy

Originally Posted by**malaygoel**

a/sinA =b/sinB =c/sinC =2R

(b-c)/(b+c)=(2RsinB-2RsinC)/(2RsinB+2RsinC)

=(sinB-sinC)/(sinB+sinC)

I can't write next step, use addition and subtraction fromulae and you will get X

- May 31st 2006, 02:55 AM #8

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- Jun 1st 2006, 08:37 AM #10

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Originally Posted by**malaygoel**

The extended sines law