Answer:
c and a
Step-by-step explanation:
the simple logistics would make it equal those 2 answers
If

were incorrect, it means that

were correct

There were 28 problems ;)
Tan 2x - cot x = 0
2tan x / (1 - tan^2 x) - 1/tan x = 0
2tan^2 x - (1 - tan^2 x) = 0
2tan^2 x - 1 + tan^2 x = 0
3tan^2 x - 1 = 0
tan^2 x = 1/3
tan x = + or - 1/√3
10
20
30 there u go
that the rounding
I only know number 9
9. 9x+38