Simplify $$(\frac{1}{sin^2A} - 1) \space where \space 0 < A \leq 90^o.$$​​

Correct option is A

Given:

 $$(\frac{1}{sin^2A} - 1) \space where \space 0 < A \leq 90^o.$$ 

Formula Used: 

​$$sin^2A + cos^2A = 1$$​​

Solution: 

$$(\frac{1}{sin^2A} - 1)$$

​$$= \frac{1-sin^2A }{sin^2A} \\\ \\= \frac{cos^2A}{sin^2A} \\\ \\= cot^2A$$​​