Answer :
cotθtanθ = 1
You can rewrite cotθ as 1/tanθ, so
(1/tanθ)tanθ
Then from there you can simplify to
tanθ/tanθ which would equal 1
You can rewrite cotθ as 1/tanθ, so
(1/tanθ)tanθ
Then from there you can simplify to
tanθ/tanθ which would equal 1