Question

(cos²A-1) (cot²A+1)= -1​

Answer 1

Step-by-step explanation:

=(cos^2 A -1) (cot^2 A +1)

=(1-sin^2 A -1) (cosec^2 A -1+1)

=(-sin^2 A) (cosec^2 A)

= -sin^2 A ×1/sin^2 A

= -1 //