Question

Prove the following identities:-
1
1
sec 0-1 sec 0+1
= 2cot20​

Answer 1

Step-by-step explanation:

$( \secθ - 1)( \secθ + 1)$

It is in the form of;

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

$⇒ ({ \sec θ ) }^{2} - {1}^{2}$

$⇒ { \sec }^{2} θ - 1$

$⇒ \tan^{2} θ$

HOPE THAT HELPS!!