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Solve `tan^(2) theta+cot^(2) theta=2`.

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Solve `tan^(2) theta+cot^(2) theta=2`.
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Correct Answer - `theta= n pi pm pi/4, n in Z`
`(tan^(2) theta-1)^(2)=0`
or `tan^(2) theta=1`
`rArr theta = npi pm pi//4, n in Z`
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