SOLUTION: Can you help battle with this; Given ; sin(x+y) = sin x cos y +cos x sin y and cos (x+y) =cos x cos y -sin x sin y ; derive a formula for cot (x+y).

Algebra ->  Trigonometry-basics -> SOLUTION: Can you help battle with this; Given ; sin(x+y) = sin x cos y +cos x sin y and cos (x+y) =cos x cos y -sin x sin y ; derive a formula for cot (x+y).      Log On


   

Question 983612: Can you help battle with this; Given ; sin(x+y) = sin x cos y +cos x sin y and cos (x+y) =cos x cos y -sin x sin y ; derive a formula for cot (x+y).
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
cot = cos/sin
----------------
--> cot%28x%2By%29+=+%281+-+tan%28x%29%2Atan%28y%29%29%2F%28tan%28x%29+%2B+tan%28y%29%29