Use the cofunction of a complementary angle. PLEASE HELP ME!

Question

tan θ = cot (30° + 5θ)

Answer 1

cot(30° + 5Ø)
= tan(90 - (30+5Ø))
= tan(60 - 5Ø)

then tan Ø = tan(60-5Ø)
Ø = 60-5Ø
6Ø = 60
Ø = 10°