Respuesta :

Answer:

The value of given expression is - 3    

Step-by-step explanation:

Given expression as :

- 2 (cosec²Ф - cot²Ф ) - 1

Now , ∴ cosec²Ф = 1 + cot²Ф

SO, -2 (1 + cot²Ф - cot²Ф) - 1

Or,   -2 (1) - 1

Or, -2 - 1 = -3

Hence the value of given expression is - 3    Answer