wolframalphaで −2 sinx^2 + cos x + 1 ,0<=x<=pi https://www.wolframalpha.com/input?i=%E2%88%922+sinx%5E2+%2B+cos+x+%2B+1+%2C0%3C%3Dx%3C%3Dpi&lang=ja −2 sinx^2 + cos x + 1 < 0,0<=x<=pi https://www.wolframalpha.com/input?i=%E2%88%922+sinx%5E2+%2B+cos+x+%2B+1+%3C+0%2C0%3C%3Dx%3C%3Dpi&lang=ja π/3<x<π
wolframalphaで
−2 sinx^2 + cos x + 1 ,0<=x<=pi
https://www.wolframalpha.com/input?i=%E2%88%922+sinx%5E2+%2B+cos+x+%2B+1+%2C0%3C%3Dx%3C%3Dpi&lang=ja
−2 sinx^2 + cos x + 1 < 0,0<=x<=pi
https://www.wolframalpha.com/input?i=%E2%88%922+sinx%5E2+%2B+cos+x+%2B+1+%3C+0%2C0%3C%3Dx%3C%3Dpi&lang=ja
π/3<x<π