`(sec A + tan A -1) (sec A - tan A+1)=`

1/(sec A + tan A) = sec A - tan A

Prove the following identities : (sec A - tan A)/ (sec A + tan A) = 1 - 2 sec A tan A + 2 tan^(2) A

Is (sec x + tan x + 1)(sec x - tan x - 1) - 2tan x = 0 an identity.

If sec A + tan A = 1/3, then sec A - tan A =…………

Prove that sec A (1 -sin A) (sec A + tan A) =1.

Prove the following identities : (1)/ (sec A + tan A) = sec A - tan A

( sec A + tan A ) ( 1 - sin A ) = ?

If (sec A + tan A)(sec B + tan B)(sec C + tan C) = (sec A- tan A)(sec B- tan B)(sec C tan C) Prove that each side is equal to +-1.

Prove that sec A (1 - sin A)(sec A+ tan A) = 1.