URGENT: I kinda need help with homework

I'm not sure if a majority of you guys have taken Pre-Calculus yet but I'm struggling and if you know any tips, I would appreciate them

So I need to use the equation:
tan(α+β)=((tanα+tanβ)/(1-tanαtanβ))
I need to use the unit circle to find the exact value of cot (-5π/12) or cot -75 degrees. I already know that you need to use the multipliative inverse of the equation to get cot but how do I simplify correctly?

heres what i heard:

figzuhiflkdfgudhfighufgodfgdffg+giaudfhgaoiudfhgjzdlfkhgzifuhvzifuovjzdfnzi


i have no idea what you r saying ;-;

(im liek in middle school...)

you shouldnt be asking for homework online... thats sorta cheating.
ask your mom or somethin

@Penelope, My mom doesn't know and my teacher encourages us to ask for help on the internet if needed (he says that the internet is a wonderful tool if used right). Plus homework doesn't even count for a grade so it's not cheating. I'm not even asking for the answer either, I'm asking for tips.