6.1 identities.notebook
February 27, 2017
Simplify
6.1 identities.notebook
February 27, 2017
Simplify.
1. secx cotx
2. cotx secx sinx
3. Verify that
sinx tanx + cosx = secx
6.1 identities.notebook
February 27, 2017
Techniques =
1. work with the more complicated side
2. convert everything to sines and cosines.
3. use algebra - factor, common denominators,
splitting fractions, etc.
4. if there are squared terms look for pythag. ids.
5. take any (-x)'s and re-write as (x)'s.
cosx - cosx∙ sin2x = cos3x
Algebra
cosx
1 + sinx
+
1 + sinx
cosx
= 2secx
6.1 identities.notebook
February 27, 2017
Splitting fractions
1 + sinx
cosx
=
secx + tanx
cot(-x)∙sinx = -cosx
1 - sin2x
cosx∙cotx =
sinx
6.1 identities.notebook
February 27, 2017
pg 596
1-17 odd