66.(sec A+tan A-1)(sec A-tan A+i)=2tan A

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

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

(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

(sec A + tan A)/(sec A-tanA) = tan^2(pi/4 + A/2) prove that

sqrt((sec A-tan A)/(sec A+tan 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 (1+sec A-tan A)/(1+sec A+tan A)=1-sin A/(cos A)

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