secA(1-sinA)(secA+tanA)=1
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secA(1-sinA)(secA+tanA)
=> 1/cosA(1-sinA)(secA+tanA) -----> we are simplifying secA
=> (1/cosA - sinA/cosA)(secA+tanA) ---> we are multiplying
=> (secA - tanA)(secA+tanA) --------> because 1/cosA = secA and sinA/cosA = tanA
=> sec^2A - tan^2A ---> using identity (a+b)(a-b) = a^2 - b^2
=> 1 (according to identity)
HOPE THIS HELPS U.
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