C-09-Q114mediumsingle_mcq(secA−tanA)(secA+tanA)=?(\sec A - \tan A)(\sec A + \tan A) = ?(secA−tanA)(secA+tanA)=?a111b000ccos2A\cos^2 Acos2Adtan2A\tan^2 Atan2Aব্যাখ্যাThis is sec2A−tan2A\sec^2 A-\tan^2 Asec2A−tan2A, which by the identity sec2A=1+tan2A\sec^2 A=1+\tan^2 Asec2A=1+tan2A equals 111.