- Dy / dx of cos^-1x?

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Show that 2^x=-x has at least one root.? F'(t) = sec(t)(sec(t) + tan(t)), −(π/2) < t <(π/2) , f(π/4) = −7. Find f? Not sure how to do this math problem, pls show work so I can learn? Hello im doing my finals and i need to know how would i calculate acid concentration in lemons? Find the area enclosed by the x-axis and the curve x = 8 + e^t, y = t − t^2.
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