# Dating age difference formula for sine

### Math Forum - Ask Dr. Math Date: 09/07/99 at From: David Morgan Subject: Solving unknown . and difference formulas; - the Taylor series method to calculate one sine or cosine. Abu al-Wafa had sine tables in ° increments, to 8 decimal places also established the angle addition and difference identities. Date: 07/20/ at From: Andy Subject: Trigonometry | Identities b) | 2 \ / And that is the product-to-sum formula for Sin(a) Cos(b). This is mainly because I was looking for two expressions whose sum is x and whose difference is y. Choose "whole words" when searching for a word like age. And why don't they teach us that? And now that we have computers, the methods used to compute trig functions in computers or scientific calculators make use of things you won't learn for a while yet. But it's good to learn enough about these methods to appreciate the fact that you have tables and calculators. So here is something I wrote for another student who wondered how one can calculate a trig function by hand.

I hope it helps you a little. That begs the question: How were those tables calculated? I know of three methods. I must admit I have never used any of them!

## File:Half-age-plus-seven-relationship-rule.svg

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### History of trigonometry - Wikipedia

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The value of the aggregate formula will be computed for each data point that is displayed in the report in which it is used i. If you are interested in learning more about this, search our archives for old questions and answers on this subject.

To search our archives, go to: So, that is a brief description of geometry. How is it similar to or different from trigonometry? Well, trig and geometry are actually intricately related: In its most basic form, trig helps us to determine the relationships between angles in a triangle and the lengths of the sides of the triangle.

• History of trigonometry 