Higher Secondary Question Paper Solution of Year 2018 Question No: A.2.(a)(ii)

প্রমান করো যে, \(tan({\pi \over 4} + {{1 \over 2} \ cos^{-1}} \ {a\over b}) + tan({\pi \over 4} - {{1 \over 2} \ cos^{-1}} \ {a\over b}) = {2b \over a}\)

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