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Prove that 1 + (cot^2 α)/(1 + cosec α) = cosec α - Mathematics

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Question

Prove that `1 + (cot^2 α)/(1 + "cosec"  α) = "cosec"  α`

Theorem
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Solution

L.H.S. = `1 + (cot^2 α)/(1 + "cosec"  α)`

= `1 + ("cosec"^2α - 1)/(1 + "cosec"  α)`

= `1 + ((1 + "cosec"  α)("cosec"  α - 1))/(1 + "cosec"  α)`

= 1 + cosec α – 1

= cosec α

= R.H.S.

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