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\text{\cosec}\, 2x = (1 + \cot^2 x)^{1/2}
\displaystyle[br]\begin{equation*} \left(2x - \frac{4x^3}{3} + \frac{4x^5}{15}\right) (a + bx + cx^2 + dx^3) = 1\end{equation*}
\displaystyle[br]\begin{equation*} \left(2x - \frac{4x^3}{3} + \frac{4x^5}{15}\right) (a + bx + cx^2 + dx^3) = 1\end{equation*}
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