Prove each of the following identities : `(1+ tan theta + cot theta )( sin theta - cos theta )

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Prove each of the following identities : `(1+ tan theta + cot theta )( sin theta - cos theta ) =((sec theta)/(\"cosec\"^(2) theta ) - (\"cosec\"theta)/(sec^(2)theta)) `
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Thanku so much
I was very confused in the formula part

aishaahmed