C3 trigonometry help please

How can I prove
Cot(A+B) ≡ (cotAcotB-1)/(cotA+cotB)?

Many thanks!!!

(Using "angle addition formulae")

Original post by wandirection

How can I prove
ot(A+B) ≡ (cotAcotB-1)/(cotA+cotB)?

CMany thanksddition formula)
(Using "angle
a

Want to try again?

Want to try again?

Oops I edited the question... Sorry! :smile:

Original post by wandirection

Oops I edited the question... Sorry! :smile:

I would start with the RHS

I would start with the RHS

Im not sure how to start it off on the RHS :frown:

give me a clue?

remember that cotx can be written using sinx and cosx

Original post by wandirection

How can I prove
Cot(A+B) ≡ (cotAcotB-1)/(cotA+cotB)?

Many thanks!!!

(Using "angle addition formulae")

Do you know how to prove the equivalent relation with tan(A+B) - it's basically the "reciprocal" version of that!

What kind of university is best for you?

How our community record system works

The Student Room community guidelines

Adding your personal statement to the library