9tan(5theta )+1=10

Question

I know that I first subtract 1 to 10 and then divide 9  which gives me one but i am not sure how to use the sum and differences formulas to solve tan(5theta) = 1

Answer 1

Correct so far!

tan 5θ = 1, set β = 5θ, then

tan β = 1,

 

What is β? What is θ?

 

Now present your answer within the restrictions (I did not see any)