Posted by kristen on Wednesday, July 16, 2008 at 6:35pm.
Is the final term
1/(cotB-cotA) or
(1/cotB)-cotA ??
Is the numerator term (cotA cotB +1) or 1 ?
When you write equations like that, we can't tell what you mean.
I suggest you start with the identities for cos (A-B) and sin (A-B) and take the ratio of the two.
cos(a+b)/sin(a+b)=
cosacosb+sinasinb/sinacosb-cosasinb
multiplying and dividing by sinasins then it becomes
cotacotb+1/cotb-cota
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