Question

tan 10tan 15tan75tan80=1​

Answer 1

Answer:

Tan10 Tan15 Tan(90-75) Tan(90-80)

=Tan10 Tan15 Cot15 Cot10

=The value of Tan Thetha multiple by Cot Thetha = 1

Hence, Tan10 Cot10 Tan15 Cot15=1

Answer 2

Answer:

tan(90-80)×tan(90-75)×tan75×tan80

cot80×tan80×cot75×tan75

=1 answer