" 14."(1)/(sec A+tan A)=sec A-tan A

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

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

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

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=

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 the value of each side is +-1

(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 of the side is equal to +-1

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

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