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Q.

If TanA + TanB = P and CotA + CotB = q then Cot(A+B)=

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a

pqp+q

b

p-qpq

c

q-ppq

d

pqp-q

answer is B.

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Detailed Solution

tan A+tan B=pcot A+cot B=q1tan A+1tan B=qtam A+tan Btan A tan B=qpq=tan A tan Btan(A+B)=tan A+tan B1-tan A tan B =p1-pq =pqq-pcot(A+B)=q-ppq

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