Question

(1+ cot² A)/(1+ tan² A) is equal to 

A) tan² A

B) sec² A

C) cosec² A – 1

D) 1 – sin² A​

Answer 1

(1+cot²A )/ (1+tan²A) = (cosec²A )/ (sec²A) [°•° cosec²A - cot²A =1 & sec²A-tan²A =1]

= cot²A = cosec²A -1