Trig identities

[ashleymorgan]

I need help finding the identities for the following problems: (if anyone could help show me how to do even one that would help a bunch)

1. (cos^(3)x-cosx)/(sin^(3)-cosx)

2. (cos3x-cosx)/(sin3x-sinx)

3. cotx+sinx/(1+cosx)

4. tanx-cotx

5. sec2x

6. sinx/(sinx+cosx)

7. (1+sinx)/ (1-sinx)

 

[pitoten]

For #1 (cos^(3)x-cosx)/(sin^(3)-cosx):

I think you mean the denominator to be sin^(3)x - sinx.

 

[ashleymorgan]

Oh yes sorry you are right