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Old 08-08-2007   #1
suganya
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Default 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.

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Suganya
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Old 08-08-2007   #2
Sillysidley

 
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Hint
Show more:
.
Take the inverse to find .
Then try proving it.
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Last edited by Sillysidley; 08-08-2007 at 04:08 PM..
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