Question

Find the value of tan 10. Tan 20 . Tan 70.Tan 80

Answer 1

Answer:

Ans is 1

Step-by-step explanation:

Tan 10. Tan 20. Tan(90-20). Tan(90-10)

= Tan10. Tan20. Cot20. Cot10

= Tan10. Cot10. Tan20. Cot20

= 1