Prove each of the following identities : ` (sin theta + cos theta)/(sin theta - cos theta)

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Prove each of the following identities : ` (sin theta + cos theta)/(sin theta - cos theta) + (sin theta - cos theta)/(sin theta + cos theta) = (2) /((sin^(2) theta - cos^(2) theta)) = (2) /((2sin^(2) theta -1)) `
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