Wb Jee
Trigonometric Functions And Equations
WB JEE 2025
MCQ+1 / -0.252025
যদি $f_n(x)=\tan \frac{x}{2}(1+\sec x)(1+\sec 2 x) \ldots\left(1+\sec 2^n x\right)$ হয়, তাহলে
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