- Simplify the logarithm log3 9 - log3 1/27?

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Can somebody help me differentiate f(x)= (-x^2-1)/(x^2-1)^2 and get the answer as f''(x)= (2x^3 +6x)/(x^2-1)^3? I missed a couple geometry classes so I need help with this. Thank you! https://gyazo.com/028718f1750dcb1e8cb96185f18cf272? Why does perforated bowel get seen by the surgeon on-call immediately but appendicitis doesn't get seen until the morning? Does any one have Embedded holography using light beam, documents and can provide the link ? If I give the answer for critical value is it the same as p value?