`p cot x+ q cot y = cot z`

What is ( tan x + tan y ) ( 1 - cot x cot y ) + ( cot x + cot y ) ( 1- tan x tan y ) equal to ?

Show that cot 2x cot x - cot 3x cot 2x -cot x=1

cotx cot 2x - cot 2x cot 3x - cot 3x cot x = 1

Prove that cot 2x cot x- cot 3x cot 2x - cot 3x cot x=1

If sin x + sin y + sin z = 0 and cos x + cos y + cos z = 0 then prove that cot (x+y)/2 = cot z and cos (x-y)/2 = pm 1/2

If tan A - tan B =x and cot B - cot A=y, then: cot(A-B)=

What is cot 2x cot 4x -cot4x cot 6x- cot6x cot 2x equal to ?

If tan A - tan B = x and cot B - cot A =y , then what is cot ( A -B) equal to ?