- The graph of f has a horizontal tangent line at x=- How do I solve this please :)?

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The principle of conservation of energy states that The total energy in an isolated system remains constant what does isolated system means? Why can they get a camera to work on the moon, but I can not even get local tv channels on the earth? WTF? The fourth line of Balmer series has a wavelength of 410nm. Calculate it frequency? Find the exact value of cos(cos^-1(0.09))? Q. aspirin is an acetylation product of a)p-dihydroxybenzene
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