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[" (iv) "(tan^(2)theta)/(tan^(2)theta-1)...

[" (iv) "(tan^(2)theta)/(tan^(2)theta-1)+(cosec^(2)theta)/(sec^(2)theta-cosec^(2)theta)],[qquad 1=(1)/(sin^(2)theta-cos^(2)theta)]

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