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ICSE Class X Math 2018 Paper

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Question : 18 of 32
Marks: +1, -0
Prove that (1+cot⁡θ−csc⁡θ)(1+tan⁡θ+sec⁡θ)=2(1+\cot\theta-\csc\theta)(1+\tan\theta+\sec\theta)=2
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