Madhyamik Question Paper Solution of Year 2017 Question No: 12.(iii)
যদি \(\ tan \ 9^0 = {a \over b}\) হয়, তবে প্রমাণ করো যে, \({{sec^281^0}\over {1+cot^281^0}}= {b^2\over a^2}\) ।
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