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GEOMETRY IS SO HARD! https://gyazo.com/b44c0bab1489d9913b285171d0a99ac2? What is the tonnage of one cubic metre of quarry stone? What are the chances that California fires would smash the whole state? Species like Nostoc and Anabaena form filaments. So are they multicellular? 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?