The value of (11/cot2titha - 11/cos2titha) is
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=> (11/cot2theta - 11/cos2theta)
=> ( 11/ cos 2theta /sin 2 theta - 11/ cos 2 theta )
=> ( 11 sin 2 theta / cos 2 theta - 11/ cos 2 theta )
=> ( 11 sin 2 theta - 11 / cos 2 theta )
=> ( 11( sin 2 theta - 1 ) / cos 2 theta
=> [ 11 ( 2tan theta / 1+ tan^2 theta - 1 ) / 1- tan^2 theta / 1+ tan^2 theta ]
=> [ 11 ( 2tan theta - ( 1+ tan^2 theta ) / 1 + tan^2 theta ) / 1- tan^2 theta/1 + tan^2 theta ]
you can further solve it
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