Question

tan36°+tan9°+tan36°tan9°=1

Answer 1

Answer:

Step-by-step explanation:

tan36°+tan9°+tan36°tan9°=1

tan36°+tan9° = 1 - tan36°tan9°

tan36°+tan9° / 1 - tan36°tan9° = 1

tan(36° + 9°) = 1

tan45° = 1

1 = 1

Hence proved.