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Using reciprocal identities \csc\alpha = \frac{1}{\sin\alpha}, ~\sec\alpha=\frac{1}{\cos\alpha} the given expression becomes

Multiply top and bottom by \sin^2\alpha and get

Plugin the given value and simplify
2 5 2
hey i asked another question, can u try to do it plzz
i tried a bit and gave up as it got complicated lol il give it a try again..
ok np