C-09-Q115mediumsingle_mcq(cosecA−cotA)(cosecA+cotA)=?(\operatorname{cosec} A - \cot A)(\operatorname{cosec} A + \cot A) = ?(cosecA−cotA)(cosecA+cotA)=?a111b000csin2A\sin^2 Asin2Adcosec2A\operatorname{cosec}^2 Acosec2Aব্যাখ্যাThis is cosec2A−cot2A\operatorname{cosec}^2 A-\cot^2 Acosec2A−cot2A, which by the identity cosec2A=1+cot2A\operatorname{cosec}^2 A=1+\cot^2 Acosec2A=1+cot2A equals 111.