(sec2 theta _1)cot2 theta=1
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(sec^2 theta -1)×cot^2 theta
as( sec^2 theta-1)=ten^2 theta
so, ten^2 theta× cot^2 theta
= ( 1/cot^2 theta)× cot^2 theta
=cot^2 theta/cot^2 theta
=1
as( sec^2 theta-1)=ten^2 theta
so, ten^2 theta× cot^2 theta
= ( 1/cot^2 theta)× cot^2 theta
=cot^2 theta/cot^2 theta
=1
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