We're learning how to solve quadratic trigonometric equations:

ex. 3sin^2x - 8sinx -3 = 0

(3sinx+1)(sinx-3) = 0

then go on from there...

but how do I solve this one?

cotxcosx=cosx ?

Do I sub in 1/tanx for cot x ? where do I go from there?

Id appreciate some help