Question

cot squared theta minus one upon sin square theta equal to minus 1 prove that

Answer 1

(I am taking tita= A for my convenience)
we know that cot²A = cos²A/sin²A
substitute that in the equation
we get,
  cos²A/sin²A - 1/sin²A = -1
now,
cos²A-1/sin²A = -1
⇒ -(1-cos²A)/sin²A = -1
as [1-cos²A = sin²A]
  -(sin²A)/sin²A = -1
 -1=-1
  hence proved
 hope u have understood the answer

Answer 2

I think it helped you
the easiest way