Question

(iii) (1 + tan A)² + (1 - tan A)² = 2 sec² A​

Answer 1

Answer:

Step-by-step explanation:

We know that (a + b)² + (a - b)² = 2(a² + b²)

(1 + TanA)² + (1 - TanA)²

=> 2( 1 + Tan²A)

=> 2Sec²A.