Trig functions
Domain and Range
Based on Professor Leonard, Trig 8(Precalculus 81)
domain |
range |
|
---|---|---|
Reciprocal Identities
(from Trig 9 precalc 82)
Because (for unit circle)
Etc. for other recip functions. Easy. Skip
But then here’s equation for circle:
Looks like Pythagorean theorem, because it is! Can always inscribe a right triangle onto a circle this way.
So given:
So y is 12, r = 13. OR can make it
So let’s find x (I did)
$
Important that
Once again, review,