plot {csc^2(sqrt t) - 1/t, 1/3(1+ t(1/5+t(2/63+ t(1/225+ 2t/3465(1+2537t/61425)))))}, {t,0,pi^2/4}plot {csc^2(sqrt t) - 1/t, 1/3(1+ t(1/5+t(2/63+ t(1/225+ 2t/3465(1+2537t/61425)))))}, {t,0,pi^2/4}

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