10. Given \( x > 0 \). Compute the value of \( \int_{0}^{1/x} \frac{1}{t^2 + 1} dt + \int_{0}^{x} \frac{1}{t^2 + 1} dt \). (10 分)
10. Given \( x > 0 \). Compute the value of \( \int_{0}^{1/x} \frac{1}{t^2 + 1} dt + \int_{0}^{x} \frac{1}{t^2 + 1} dt \). (10 分)