tanA+tanB/cotA+cotB=tanAtanB
prove that
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cotA +cotB= 1/tanA+1/tanB
=tanA+tanB/tanAtanB
putting the value of cotA+cotB in LHS,
tanA+tanB/tanA+tanB/tanA tanB
=tanAtanB=RHS
=tanA+tanB/tanAtanB
putting the value of cotA+cotB in LHS,
tanA+tanB/tanA+tanB/tanA tanB
=tanAtanB=RHS
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