`(sec A+tan A-1)(sec A -tan A+ 1)=2tan A`

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

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

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

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.

sqrt((sec A-tan A)/(sec A+tan A))=?

tan^(-1)(sec x+tan x)

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

If k=( sec A + tan A) ( sec B+ tan B) sec C + tan C)=(sec A - tan A)(sec B- tan B)(sec C - tan C) " then " k=

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