Question

tan A +tan B
Prove that
cot A +cot B
= tan Atan B.​

Answer 1

Answer:

Explanation:

(tan A+tan B) / (cot A+cot B)

⇒(tan A+tan B) / (1/tan A+1/tan B)

⇒(tan A +tan B) / (tan A+tan B / tan A·tan B)

⇒(tan A+tan B) / (tan A·tan B / tan A+tan B)

⇒tan A ·tan B

hence proved

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