Question

I didn't get the answer ​

Answer 1

Answer:

Step-by-step explanation:

Formula used in this question -:

1+cot²x = cosec²x

(cot²A)(cosec²B) - (cot²B)(cosec²A)

Using the above formula-:

=(cot²A)(1+cot²B) - (cot²B)(1+cot²A)

=(cot²A + cot²A cot²B) - (cot²B + cot²A cot²B )

=cot²A - cot²B     [Hence proved]