Trigonometry - XP Math - Forums

 XP Math - Forums Trigonometry

 08-08-2007 #1 suganya Guest   Posts: n/a Trigonometry Pls help me how to solve this. If cotB - cotA = b and tanA - tanB = a. Prove that cot(A - B) = 1/a + 1/b. Regards, Suganya
 08-08-2007 #2 Sillysidley   Join Date: Oct 2006 Posts: 822 HintShow more: $tan (a-b)=\frac{tan a-tan b}{1+tan a*tan b}$. Take the inverse to find $cot(a-b)$. Then try proving it. __________________ . Last edited by Sillysidley; 08-08-2007 at 04:08 PM..

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