Q. 233.7( 4 Votes )

# If tanA + tanB =A And CotA + CotB =B, prove that: cot(A +B) = 1/a – 1/b.

Answer :

Given tanA + tanB =A And cotA + cotB =B

Consider cotA + cotB =B

Then,

RHS

We know that

= cot(A +B) = LHS

Hence, proved.

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