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prove; 1).cosec A(1+cos A)(cosec A - cot A)=1 2).sec(square)A + cosec(square)A=sec(square)A.cosec(square)A 3).(1+tan2 A)cot A ___________________ = tan A cosec2 A 4).tan2 A - sin2A = tan2A . sin2A pls note; it is unable to write 2 as superscript i meant it as raised to 2.