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Copyright: 1996  2024 Webmaster:
Kirt Blattenberger,
BSEE  KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dialup modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
AirplanesAndRockets.com


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Trigonometric Identities 
In mathematics,
trigonometric identities are equalities that involve trigonometric functions that are true for every single value
of the occurring variables. Geometrically, these are identities involving certain functions of one or more angles.
These are distinct from triangle identities, which are identities involving both angles and side lengths of a
triangle. Only the former are covered in this article.
These identities are useful whenever expressions
involving trigonometric functions need to be simplified. An important application is the integration of
nontrigonometric functions: a common technique involves first using the substitution rule with a trigonometric
function, and then simplifying the resulting integral with a trigonometric identity.
 Wikipedia

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