https://ja.wolframalpha.com/input?i=integrate%28sqrt%28sin%28x%29%5E2%2B1%29*sin%282x%29%2C+%28x%2C+Pi%2F2%2C3%2F4*Pi%29%29
https://ja.wolframalpha.com/input?i=integrate%28sqrt%28sin%28x%29%5E2%2B1%29*sin%282x%29%2C+%28x%2C+Pi%2F2%2C3%2F4*Pi%29%29