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Establish the Identity: cot(2)=cot-1/2seccsc. The question wants you to focus on the left side.

Establish the Identity: cot(2θ)=cotθ-1/2secθcscθ. The question wants you to focus on the left side.      

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9 here given that Cot 20 60 1 seco caselo 2 taking left side Cot20 Cos20 Sin 20 Cos... blur-text-image

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