Question

tan Π/10 + tan 3Π/10 + tan 7Π/10 +tan 9Π/10​

Answer 1

Answer:

Step-by-step explanation:

tan 9pi/10 = tan(pi- pi/10) = - tan pi/10

Thus

tan pi/10 + tan 9pi/10 = 0

tan 7pi/10 = tan(pi- 3pi/10) =

= - tan 3pi/10

Thus

tan 3pi/10 + tan 7pi/10 = 0.

Finally

tan pi/10 + tan 3pi/10 + tan 7pi/10 +

+ tan 9pi/10 = 0.

Answer 2

0 is the answer of this question