diff(−5x^3 + 4x^2 − 27) https://www.wolframalpha.com/input?i=diff%28%E2%88%925x%5E3+%2B+4x%5E2+%E2%88%92+27%29&lang=ja diff(−5x^3 + 4x^2 − 27),x=-15 https://www.wolframalpha.com/input?i=diff%28%E2%88%925x%5E3+%2B+4x%5E2+%E2%88%92+27%29%2Cx%3D-15&lang=ja
diff(−5x^3 + 4x^2 − 27)
https://www.wolframalpha.com/input?i=diff%28%E2%88%925x%5E3+%2B+4x%5E2+%E2%88%92+27%29&lang=ja
diff(−5x^3 + 4x^2 − 27),x=-15
https://www.wolframalpha.com/input?i=diff%28%E2%88%925x%5E3+%2B+4x%5E2+%E2%88%92+27%29%2Cx%3D-15&lang=ja