We learned in calc the sum and difference identities:
For the most part it's not too bad, but I'm confused on a couple of problems in my book.
What would tan(a-b) be if sin a = .67, cos a = .74, sin b =.13 and cos b =-.99
The cos of b, if you notice, is negative.
how do I find tan(a + pi)?
what's cos (a + pi/3)?
and what's sin (pi/6 - a)?
Thanks a lot!