Angle Sum and Difference Identities
See also: #Product-to-sum and sum-to-product identitiesThese are also known as the addition and subtraction theorems or formulæ. They were originally established by the 10th century Persian mathematician Abū al-Wafā' Būzjānī. One method of proving these identities is to apply Euler's formula. The use of the symbols and is described in the article plus-minus sign.
| Sine | |
|---|---|
| Cosine | |
| Tangent | |
| Arcsine | |
| Arccosine | |
| Arctangent |
Read more about this topic: List Of Trigonometric Identities
Famous quotes containing the words angle, sum and/or difference:
“The good lawyer is not the man who has an eye to every side and angle of contingency, and qualifies all his qualifications, but who throws himself on your part so heartily, that he can get you out of a scrape.”
—Ralph Waldo Emerson (1803–1882)
“Never is a historic deed already completed when it is done but always only when it is handed down to posterity. What we call “history” by no means represents the sum total of all significant deeds.... World history ... only comprises that tiny lighted sector which chanced to be placed in the spotlight by poetic or scholarly depictions.”
—Stefan Zweig (18811942)
“The difference between a saint and a hypocrite is that one lies for his religion, the other by it.”
—Minna Antrim (b. 1861)